Hello group- Just got this message along with the one previous, sounds like an interesting book. Is it more of a treatise or does it go in depth on design? Also the big question- What is the title?
Thanks for the help Regards, Henry On 10/28/96 17:38:48 you wrote: > >Hello, > > I got my copy of Willard's text from Willman-Bell in Richmond, VA. >Their phone number is 804-272-5920, the cost was around 17.00 USD. It is >a good book about a very remarkable man and it does have several pages >specifically describing his sundial designs accompanied with pictures, >some of the designs esp. his sunclocks are very ingenious. Most of his >Sundial's were designed while he was at CalTech working with the Mt >Palomar design group, alas I can't find any vertical sundials he may >have done that are very interesting. I too wasn't able to find any >mention of Porter in the 1996 NASS Sundial Registry! However, a picture >of the stolen CalTech sundial that Porter designed can be seen by >accessing the URL below. > >http://www.caltech.edu/cgi-bin/arctohtml?30.19-1 > > Porter's Garden Telescope was what might be called an "active" instead >of passive sundial. The telescope was moved in equatorial mode (it could >function in alt/azi too) until a complete image of the Sun's disk was >formed on a piece of paper at the focal plane of the eyepiece. Then the >Right Ascension (hour angle) was read and with a correction for local >longitude and the equation of time Standard time can be calculated. This >can be done with any equatorial mounted scope. An article p75 of >October's Sky and Telescope gives a good account of Porter's Telescope. > > >Regards, > >Luke > >
