Latin motto

SINE - it's written on a banner. Thanks, John Davis N52 5m E1 3m

Re: plotting timelines for giant sundials

. That's the theory - the proof will come next month! Any other suggestions welcomed. John Davis

Re: Heliograph

, and there are various quotes from Geronimo, who believed the flashes were spirits! All I need to do now is find someone else with a heliograph, and then we can have aconversation (after I've learned Morse!) Regards, John Davis

Re: A Tough One?

latitudes. You may have to iterate around the above loop a couple of times if there is significant uncertainty as to the declination. I hope this helps - I have the Excel plots from the Wendon Lofts dial if they are of any use. John Davis

Re: Laser Trigon

, John Davis

Re: More on Metal Sundial Processes

Tony, Great stuff! Can you give any indication of how much currect is needed (per square inch of object?). Also, have you ever tried masking some areas of the film ( hour numbers) before the dying process, so that they come out a contrasting (or clear) colour? Cheers, John

Re: Making Metal Sundials II

This is real cookery! As an alternative to etching face down in a flat dish, it is simple to use a vertical tank as supplied for etching PC boards. These are tall and very thin - about 1.5 cm wide, and big enough to take the plate that is being etched. Easy to make with two sheets of perspex

A Sundial Glossary

Dear Dialling Colleagues, The British Sundial Society (BSS) has decided that a Glossary of dialling terms would be a good idea. It would have two main purposes: - to provide a refererence source for newcomers to dialling, and - to try to set preferred definitions of the terms, symbols and

Anodised Sundials

Hi Tony (Moss), Just thought I'd let you know that I'm underway with some anodising experiments (better than Xmas shopping, anyway!). By following your instructions, I've succeeded in getting a nice yellow finish on a 10x10cm square of aluminium. It's clearly an alloy of some sort, but I don't

Re: Solstice Perigee

Roger, I'm not sure of the exact time of Full Moon, but according to my Psion the declination at midnight will be 19deg26min. I hope that helps! John Dr J R

Transalpine hours

Hi all, I've come across a reference to "transalpine hours" in Heilbron's excellent "The Sun in the Church" (pg 66). This is a term which escaped me when I was compiling the BSS Glossary. Can someone supply a definition, please. Regards, John

Re: shadow velocity shadow tracing

John Carmichael wrote (replying to Chris Lusby Taylor): You're right! I realized as soon as I sent my message that a small diameter floodlight with a wide beam would be better than a tight beam, because it must illuminate the entire style and not just a portion of it. A drawback with the

Re: Azimutha Sundial (once more)

Hi all, I've been watching this thread with interest, and have been honoured that the draft Sundial Glossary which I'm editing for the BSS has been quoted a few times for the definitions. I should say, though, that these definitions are not yet definitive(!) and I am still working to refine

Re: sundial taxonomy

Hi All, I'll buy this, and put in in the next draft of the Glossary. I really don't want a different term for every possible type of dial! Regards, John Dr J R Davis Flowton, UK 52.08N, 1.043E email: [EMAIL PROTECTED]

Sundial Glossary Update

Happy New Year to all diallists! To prove that I haven't got too much of a hangover, a new version (including downloadable files) of the Glossary is now online at www.btinternet.com/~john.davis This version has a major upgrade of the text, based on all the inputs I have gratefully

Chinese dial

Hi Dialling Colleagues, A member of the public (i.e. not a sundial enthusiast) contacted me for help with an item which was sold to him by an antique dealer as a mid-18th century Chinese sundial. He wanted to know something about it, and particularly how to set it up and read the time. I've

Introductory astronomy sites

Hi all, Please can anyone point me at suitable URL's of basic astronomy, capable of answering questions of the why does the sun rise in the East and what causes the seasons? type. I have a contact at the local museum who is putting together an astonomy/sundial trail for primary schoolchildren

Sundial Glossary - out now

Hi Dialling Colleagues, I'm pleased to announce that the first edition of the BSS Sundial Glossary is now available. The Glossary is A4-size, has soft covers andhas 42 pages (similar to a BSS Bulletin). Printed versions can be obtained from: Ms Margery Lovatt, BSS Sales Studio 5, Parndon

Re: Nought at noon

Steve, I believe I have seen this use of 0 for noon very occasionally on English vertical dials - although at the moment I can't think where! I believe Bob Terwilliger is right - it's done for spacing reasons, and possibly the maker isn't religious! John

Re: IIII at IV

Hi all, I used to think that, in dialling (rather than clocks), the form was gradually replaced with the modern IV. However, I have recently come across a case where an old vertical dial (a wooden great decliner) was replaced by covering it with a newer one. The original dial has been

Design challenge

Hi all, I have a question/challenge to all you sundial designers: what is the most accurate design for a Standard Time dial? The reason behind the question is to find a way to stop members of the public looking at a public dial, inspecting their watches, and concluding that dials never tell

Thanks - CAD Help

Colleagues Thanks to all of you who responded with help in translating CAD files into a format suitable for drawing packages. I was guided to Paintshop Pro v5, which I already had, but then found that my venerable CAD program (TurboCAD v3) produces a rather non-standard .dxf format which

Re: Ceiling Dials

There is a well-known ceiling dial at the Horniman Museum. It was designed by BSS-member John Moir (amongst others). I'm sure he would be please to discuss details with you. John Dr J R Davis Flowton, UK 52.08N, 1.043E email: [EMAIL

Re: Fibre optic cables

Hi Mike, For hobby supplies in the UK, try Maplins at www.maplins.co.uk. They deliver next-day. Other likely suppliers are Farnell and RS Components. - I think I can find contacts if you don't know them. John -- Dr J R Davis Flowton, UK 52.08N,

Re: Sundial by Sir Christopher Wren

Hi Mac et al, If you're looking for photos of the Wren dial, I have some that I took last summer. I can scan them for anyone that wishes, but the files would need to be quite large to convey all the detail. Regards, John - Dr J R Davis Flowton, UK 52.08N,

Re: analemmic vs. analemmatic

Hi John. In the BSS Glossary, I have defined an analemmic dial either as the one you describe, with analemmas on the hour lines, or as the type of dial which uses a gnomon with an analemma (or half-analemma) shape incorporated. This seems to fit with modern usage, and is a working definition

Re: beaded analemma date sequence

Hi all, Doug Bateman's excellent noon window dial at the Defence Evaluation and Research Agency, Farnborough, is essentially a beaded analemma with one spot per day. It uses slightly larger spots for days 5,10,15,20,25 and the last day of the month. Days 10,20 and last (whether 28,30 or 31)

Re: Bifilar Again!

Hi Claude, You wrote: The new BSS glossary does not even list the term, bifilar. This is not so - it is there under dial types, and reads: bifilar ~: invented in 1922 by Hugo Michnik in its horizontal form, although it can be on any plane. The time is indicated by the intersection on the

Re: beaded EOT graph available

Hi John, I'd like a copy of the file, please. An alternative to an EoT graph (which some members of the public find surprisingly difficult to read), many old dials used a form of table, often curved around the dial. The months, with individual days, were laid out in a linear (or circular)

Fonts for sundials

Hi all, Does anyone know of a good source for computer fonts (preferably Windows-compatible) of antique characters? Old hand-engraved dials had a very particular style which it is difficult to replicate with modern fonts. For example, the figure "8" was often flat-topped, as was the"3",

Re: FONTS

Hi Mike et al I got two responses from my original request: Andrew James suggested http://www.gate.net/~shipbrk/typograf.html The JSL Ancient font which is available as freeware from this site has the long s and several other characteristic pairs of letters including ct, st and sh. It has a

Re: Needed: history of equation of time

Hi Gordon, According to my research for the Sundial Glossary, Huygens was the first to publish an accurate EoT table in 1665, and he republished this in his Horologium Oscillatorium in 1673. Flamsteed calculated the first accurate English table in 1665, when he was only 19, but it was not

Re: sunspots

Hi John, Does anybody know the difference in the apparent diameter of the sun, in degrees, between perihelion and aphelion? Is this significant? The info you want is in the BSS Glossary (plug, plug!) under semidiameter. The answers are 15.76 arcmins in July (aphelion) and 16.29 arcmins in

Re: mystery curve

Hi all, While researching the BSS Glossary, I looked up the term "Lemniscate" in a mathematics dictionary. This is the term used, I believe, for the analemma in the Latin countries, and originally meant "ribbon-like". According to the dictionary, in English the lemniscate curve is similar

Dial on TV

Hi folks, Did anyone else spot the sundial in the (British) TV advert for the 2001 Census? It is the vertical decliner at Aldeburgh, Suffolk, BSS Serial No 0665. It is on the end of the Old Moot Hall, under some tremendous chimneys. The building is now (thanks to coastal erosion), right

Re: Solar Noon Equation of Time Calculator

Hi Gianni et al, Re. the Longitude convention: note that conventions are just that and, by definition, aren't right or wrong but accepted (or not). When I wrote the BSS Glossary, I consciously avoided using the IAU definition (0-360 degrees, Eastwards positive) in favour of the one almost

Fw: Historical locations and longitudes

Dr J R DavisFlowton, UK52.08N, 1.043Eemail: [EMAIL PROTECTED] - Original Message - From: John Davis To: Mailinglist Sundial Sent: 19 July 2001 15:09 Subject: Historical locations and longitudes Hi colleagues, I have recently had the opportunity to inspect a superb bronze

Fw: Longitudes - Thanks

Hi colleagues, Thanks to all who responded to my request for historical locations and longitudes for the C18 Adams dial. As ever, the List is fast and comprehensive. Special thanks to Bill Thayer, Andrew James, Brad Lufkin, Fred Sawyer, G Faltlhans, Frank Evans and Peter Mayer - apologies

Re: Sundial Slang

h edition of my Sundial Owner's Manual and realized that throughout the manual I explained sundial terms using sundial slang instead of the John Davis approved correct term. (Although at least in the Manual I place the correct term next to it in parenthisis) I also use sundial slang when Im

Re: Sundial Slang

, UK52.08N, 1.043Eemail: [EMAIL PROTECTED] - Original Message - From: Mario Arnaldi To: Sundial List Sent: 18 August 2001 11:08 Subject: Re: Sundial Slang - Original Message - From: Mario Arnaldi To: John Davis S

Re: Thomas Grice

Hi Gordon, According to Gloria Clifton's Directory of British Scientific Instrument Makers, Thomas Grice was a member of the Guild of Clockmakers, made free in 1675, and known to be making sundials in London in 1705 (the date on your dial). He had been apprenticed to Richard Ames in 1667.

Re: Projection Sundials

, but that is just about as general as dials which make shadows on surfaces. However, there are a lot of terms already so I'm not in favour of inventing new ones unnecessarily. But I'm prepared to be overruled! John Davis (Glossary Editor) Dear All, Could someone help me with a definition

Re: Classify sundials?

Hi Sara, Thanks for responding - I had remembered our previous discussions on the list re classifying dials, but I don't have a quotable reference to what you and your colleagues have produced that I, and the other dabblers at dialling, can refer to. Perhaps when you return home you could

Re: Making a Dial in The Gambia. What materials to use?

Hi Mike, I think Tony's idea of moulding the dial is a good one for DIY construction. As another alternative to cement, there are powders which make up to a stone substitute, like an outdoor plaster-of-paris. I have used it for small items and it is very good. Available from arts and

Re: Whats the time, where am I, whats on telly?

Hi all, A Brown wrote: I know John Davis gave a lively talk at a previous BSS meeting regarding the delineating of a dish as a sundial, I believe this may have involved covering the dish with a Mylar membrane. I hope I don't have to admit defeat and take out one of those awful

Re: A new sundial - type from Bremen!

Hi Reinhold, An excellent dial - thank you for sharing it with us. Being pedantic, I would describe it as analemmic dial, rather than an analemmatic one, but that doesn't detract from its quality. Regards, John Davis -

Re: Slopes and inclinations

! Regards, John Davis N52d 05m, E1d 08m. -

Re: Vitruvius or Oughtred?

of hour angle vs. Sun's declination or altitude look superficially similar, but are to a different geometrical projections. Best regards, John Davis 51d 05m N: 1d 08m E -

BSS June Bulletin

-sill Dial at Dartford, Kent * Dunscar Wood, Lancashire: human sundial The edition will be distributed to all BSS members as normal. Regards, John Davis -- Dr J R Davis Flowton Dials N52d08m E1d05m

Re: Shadow Sharpener Again

an apparant spot of 5 to 6mm at noon. The results (including a picture of the resulting shadow) were published in the Bulletin of the British Sundial Society, vol 14(i) March 2002. Anyone else tried one? John Davis Dr J R Davis Flowton Dials N52d 08m: E1d 05m -

Re: The heliochronometer

(as in the Pilkington and Gibbs heliochronometer) or by projecting an spot of light onto an analemma. Note: some authors use the term to describe any precision sundial No doubt this definition could be improved on: I shall watch the views of the List members with interest. Regards, John Davis

Conference dials

Hi Dialling Colleagues, For those of you who were not at the British Sundial Society Conference at Exeter in April, I have now put pictures of the dials that I displayed there on my website. It has a new URL: www.flowton-dials.co.uk Look out for * a new page on portable dials, including a

Re: High Noon

across the phrase High Noon. Can someone please tell me what that means? I didn't find it in John Davis' excellent glossary. Best wishes, Mac Oglesby - Dr J R Davis Flowton Dials N52d 08m: E1d 05m -

Re: time scale labels

Hi Jim, Although it would be technically incorect to use the terms Standard Time and Daylight Saving Time for these scales, I for one would not object as it does convey the meanings to th general public. And it does serve as a conversation-starter for us pedantic diallists ;-). If you

Hemicyclium

Hi Alexei et al, You asked: on another topic, what is the difference between a hemispherium and a hemicyclium? Descriptions of both can be found in the BSS Glossary, under Dial (types of) at www.britishsundialsociety.org.uk. Regards, John - Dr J R Davis

Re: Glossary Permission to use

Hi John, I don't see any reason why you shouldn't use extracts from the BSS Glossary in your pop-up windows - thanks for the compliment! It might be reasonable to put a credit to the BSS and a link at one point in the screed (as an electronic equivalent to a footnote). I'm happy to leave it

Re: 3-D gnomon for Polar Dial

Hi Folks, I feel that I should comment on this as it was me that initially told John Close that he couldn't achieve what he wanted in any simple way, when he came for a day's tutorial (he's a relative novice at dialling). The problem is that a polar dial is not equiangular or have equally

Re: 3-D gnomon for Polar Dial

of making such a dial will be interesting if it is to be robust enough to survive the elements. Does anyone know of a real dial in a public place? Happy Hogmanay to all diallists, John Davis - Dr J R Davis Flowton Dials N52d 08m: E1d 05m -

Re: Blenheim dial??

. If this is so, I would regard the Blenheim connection as added colour! Regards, John Davis --- from:Fred Sawyer [EMAIL PROTECTED] date:Mon, 30 Dec 2002 00:23:04 to: sundial@rrz.uni-koeln.de subject: Re: Blenheim dial?? The following message

Re: A sundial at the rebuilt World Trade Center?

Hi Bob T et al, The analemmatic dial was being drawn by Maya Lin - she was filling-in the hour spots. The caption said she was Designer - Vietnam Memorial Presumably, she is relatively high-profile in the USA. Regards, John --- Dr J R Davis Flowton Dials N52d 08m:

Re: Using a Dipleidscope

Hi all, I once built a declination-finder based on the dipliedoscope principle. The double-view of the sun was observed through a low power telescope, using an eclipse filter to make this safe. Mike is right in saying that locating the sun through the telescope is difficult. I fitted a

Re: Flies on sundials

Hi John, Fer, et all, I think Charles Leadbetter was an English author. One reason that some flies seem large is that they are sometimes representations of dragon flies, rather than houseflies. An example of this is the stained glass dial that was once in the chruch a Wendon Lofts, Essex.

Re: Construction Project

of which were in response to other queries. I have to say that while many years ago I did dozens of projects in creative anodising none of them ever included an actual sundial. John Davis on the other hand has experimented with this and might wish to comment on its potential in particular

Re: [britishsundialsociety] A new term for The Glossary?

Hi Tony et al, Congratulations on getting a commission for a dial so far north - I am sure we will all be fascinated to see such an unusual dial when it is completed. With regard to the midnight gap in the timescale, I can say that the term gnomon gap will appear in the next edition of the

Re: Sundial Carpet

the sundial face. (John Davis, do you have a term for these?) In my book, it's called a nodus!... Regards, John D Dr J R Davis Flowton Dials N52d 08m: E1d 05m -

Re: Educational Presentations

Hi Larry, I have a 45-minute presentation I gave to a group of architects and an extended (2-hour) version for the British Horological Institute. I'm also shortening it to 30-mins for the local Rotary Club next week. No text or notes, just lots of pictures of the history and development of

Sudial list member

Please could Canadian list member Brian Albinson contact me off-list ([EMAIL PROTECTED]) as I regret to say I have lost your email address. Apologies to all other list members. John Davis Dr J R Davis Flowton Dials N52d 08m: E1d 05m -

Spanish style sundials

Dear Colleagues, A Californian diallist who is not a member of this list wants to put a vertical sundial on a local church building, now used as a community centre. The church was built in the early 1900s but to the earlier Mission-sytle. The wall is approximately south-facing and of white

Re: Spanish style sundials

Hi Claude, Thanks very much for taking the time to research this for me. Martha Villegas has directed me to some useful sites in Mexico and it seems that there wasn't a single style of dials for this type of building. So my colleague (who is a client for a brass dial) can let his

Gnomons and screws

rolled plate accuracy. Can anyone tell me when the BA (British Association) screwthread standard started? I think it points to the gnomons being (old) replacements. Regards, John Davis - Dr J R Davis Flowton Dials N52d 08m: E1d 05m -

Re: Gnomons and screws

Hi Mike, I've had responses that indicate that Melville used a variety of methods to attach gnomons, from leading them in, fitting them with flanges underneath to the twisted tenons that you mentioned. No 2BA screws, though! So I am convinced that the ones on the Dunmore (Ireland) dial are

BSS Sundial Glossary - 2nd Edition

I'm pleased to announce that the Second Edition of the British Sundial Society Dialling Glossary is now available. Now subtitled "A sourcebook of dialling data" to reflect its expanded scope, it is about twice the size of the original with 84 pages, far more illustrations, a section on

Re: Anniversary-of-a-date dial

Perhaps the classic "anniversary" dial is the vertical decliner by Christopher Daniel at Chatham, Kent. It is known as the Nelson dial and it has a small circular spot in the dialface in the form of the Union Flag. This commemorates not just the date, but also the time when Admiral Nelson was

Re: Inferior Polar Dial

The Wolsey/Kratzer dial is discussed in Peter Drinkwater's booklet "The Sundials of Nicholas Kratzer". Although he doesn't analyse the hourlines, it is clear that Drinkwater is no admirer of Kratzer's dialling abilities - he accuses him of all sorts of muddles and mistakes. The "6" marking on

Re: mass-produced dial

y them too - the illustrations in the SIS Bulletin are not very clear. I suspect it may be by them. If you could send me the picture, please, I will try to match it up with the catalogue. Regards, John Davis -Frank Evans [EMAIL PROTECTED] wrote: Greetings fello

BSS Glossary,Fourier series and declination

the first edition but it would be unfair to expect him to do it again. If I ever get fed up with actually making dials, I might learn how to do it myself! Regards, John Davis -John Pickard [EMAIL PROTECTED] wrote: Gianni and others,As a long-time academic and scientist, I

Re: azimuth dial

I was intrigued by the description of the Richard Whitehead dial in the BSS Register so I'm glad that you are investigating it. Whitehead was apprenticed to my hero Henry Wynne, who's large double horizontal dials feature azimuth scales. The one at Wrest Park (Bedfordshire) has an azimuth scale

Moon transits

A colleague who is writing an article on moondials has asked if there is a website which gives the times of the moon's transit on a daily basis, and preferably from the user's location. Any offers? Regards, John Davis -Dr J R

Re: Wall Declination Measurement

Gianna got in before me with the answer to your question. I use a version of the "nail in a board" method myself. I like to take several measurements, preferably over a couple of hours, to improve the accuracy of the measurement. As well as the horizontal position, I also record the vertical

Re: dial security

You're right to think that any 17th century dial is at risk if left outside - not just by theft but also by continuing erosion by acid rain. The correct thing to do is to move the original dial inside the house where it can be properly secured and looked after. It could be replaced outside by

Re: The Merton Church Dial

Merton (near Watton, Norfolk) isn't too far from me so I'll try to get along there. Churches are often locked these days so I will try to make a contact first. Watch this space.. Regards, John -John Carmichael [EMAIL PROTECTED] wrote: Boy am I having a

Re: Wappen

I have included coats of arms on a number of brass sundials that I have made. You can see some pictures of a few of them on www.flowton-dials.co.uk If you want to see others, or larger pictures, contact me directly. Regards, John Davis Fred Jaggi

Gnomon location holes

A couple of months ago, Mike Cowham asked the SML for an explanation of the two small dots or holes seen on the dialplates of antique horizontal dials, just where the tip of the gnomon meets the dialplate. Several suggestions were made, such as their use as alignment marks to position the gnomon.

Re: Magnetic Gnomon Attachment

John, Bill is right to query this - a magnet won't attract non-magnetic stainless steel (by definition!). I think there may be varieties of stainless whichARE ferromagnetic but the attraction may not be as strong as ordinary steel. Regards, John --John

Re: Porcelain Sundial Faces

uropean firm called Vitramet who arranged for the enamelling to be done in Mexico - a very large furnace was needed!The story of the dials is in the Bulletin of the British Sundial Society, September 2004.Regards,JohnJohn Carmichael [EMAIL PROTECTED] wrote:

Statue and sundial

Dear Dialling Colleagues, A non-member of the List has asked me to forward this question: "I have a picture of an 18th century print of a plaster and lathe arch which was constructed to celebrate an election victory on Worcester [UK], replete with symbolism and classical references. On one side

Re: Wilkins

There is no "F Wilkins" in Jill Wilson's Biographical Index of British Dialmakers nor in Gloria Clifton's Directory of Scientific Instrument Makers. It is possible that he was a clockmaker or, just possibly, the dial is a fake. Is there any chance of a picture? Regards, John

RE: Sundial mottos for clergy

Hi Jim et al: The motto which the Bishop of Ely requested for the dial I made for him was: "Now is the acceptable time: now is the day of salvation" I think this is a biblical quotation. Not to my taste, but then the customer is always right! Regards, John Davis -

Re: tried hard anodizing?

Hi John,I tried some home-made anodising a few years ago, and I also used some pre-formed anodised sheets (with photoresist already applied). One item I made was an Equation of Time plaque which has been on the south wall of my house for about 4 years and still looks exactly as it did when I

Re: AW: tried hard anodizing?

Hi Hannes,The pre-anodised aluminium sheets that I have used go by the trade name of Gedakop in the UK. The manufacturers anodise aluminium sheets (of various thicknesses) by the normal methods but don't seal the pores. They apply a photoresist layer and then put on a black protective plastic

Re: Oxford college sundial

that BSS member Tony Ashmore, who lives near Oxford, is being interviewed by ITV television about it this afternoon (Monday). I'm not sure if it will be broadcast on the local or national news!Regard,John Davis -Robert Terwilliger [EMAIL PROTECTED] wrote

Re: Giant Cone Gnomon?

Hi John C,That's a BIG gnomon! It will be enormously heavy if it is solid so I would opt for a fabricated design. Although you can make a cone by rolling up a circle with a slice cut out, that would need a sheet of material large enough to draw at least part of a 24' diameter circle - not easy

Re: Slanted Roman Numerals

Hi Carl, On traditional English horizontal dials, the Roman numerals are not only slanted along the hour lines but also have their tops and bottoms as circular arcs, centred on the middle of the dialplate rather than the origins of the hour lines. Thus, although programs such as

Re: strange longitude

Hi Frank et al, That's an interesting one! I make Hawkshead about 3 deg. W of Greenwich so assuming the second figure is a longitude difference, that would put the location as approx 38deg 44' E or 32deg 44' W relative to the Prime Meridian. My first guess was that an eastern

Re: Porcelain Sundials

, by a firm in Birmingham who seem to have disappeared now. Regards, John Davis John Carmichael [EMAIL PROTECTED] wrote: st1\:*{behavior:url(#default#ieooui) }Dear Frank (cc Sundial List): I just wanted to tell you how much I

Re: Porcelain Sundials

Hi Frank et al, The Houghton Hall sundials were made by Vitramet Europe Ltd. (http://www.vitrameteuropeltd.com/). I notice that one of the dials actually features in the photomontage that heads their homepage. Although Vitramet have some facilities in the UK, the Houghton Hall dials

RE: Porcelain Sundials

Hi John C, Patrick et al, Chris Daniel once told me that the hour lines on the St Mary's Westminster dials are platinum leaf. Harriet James says that it's even worse to work with than gold leaf! Re gold in vitreous enamelling: the gold powder floats to the surface during kiln

Re: strange longitude

Dear Frank et al, I note that the letters 'PI' (as well as PII and PW) appear as one of the centres of Oughtred's Horizontal Instrument. They are actually engraved on the instrument made by Elias Allen. Perhaps this is another red herring. Regards, John D

Re: Irish Maker

.248. ii) V M, pp. 4, 134. ++ Does this sound like your man? I can look up the Sources if you haven't got them. Jill and I would be grateful for details to add to the database, please. Regards, John Davis --- Tony Moss

Re: An unusual Polyhedron

Hi Frank, Thanks for your kind comments on the Bulletin cover. I think you are a little harsh on the Downing Site polyhedral dial: I don't know of many dials with a gnomon pierced with the outline of a camel (alluding to eye's of needles, perhaps?!) or which shows so well that the

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