While I am not personnaly against sending longer attachments. The point you wish could have been made without the attachments. Imagine the inbox size (most member have) and the trouble..... not getting the mail!
*Children need encouragement to take 'decimetre to school' and break their foot-ruler*I scanned the labels on some drums of cable I currently have, and have attached them as jpeg files.
Brij<[EMAIL PROTECTED]>
From: "Brenton" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: "U.S. Metric Association" <[EMAIL PROTECTED]>
Subject: [USMA:24251] RE:Millimetres, centimetres, and decimetres
Date: Fri, 27 Dec 2002 19:22:09 +1030
Sorry, I unintentionally dropped the reference of squared mm. As I further
thought about it, I recall at work that our requests for cable was without
mention of the square, or even the millimetre. I presume that is why I did
not write it. My colleagues and I would request another 100 or 500 metre
drum of 2.5 and would not refer to the mm�. Verbally, I recall us workers
just calling it colloquially '1 point 5'or '2 point 5', and an exact number
such as 4.0mm� cable as '4 mil'. We knew it was all mm�.
I scanned the labels on some drums of cable I currently have, and have
attached them as jpeg files.
I noted that the Beldon telephone cable label gives the reference of 0.5 mm
(with out the squared) When looking at the Australian web site for this
cable http://www.belden.com.au/content.cfm?tds=1&productType=TLC%20/%20TJC
the technical specs also dropped the reference of squared. I went to a AWG
= mm� conversion web site
http://www.itvss.com/pdf/American%20Wire%20Gauge%20Conversion%20Chart.pdf
and noted that Belden should have referred appropriately with the squared mm
reference, and further to my surprise I found they even had the AWG wrong.
0.5mm� ( 20 AWG.
I also noted that our 305 metre drums of cable are actually 1000 feet. I
considered it interesting that the same cable drum gave the AWG first,
followed by metric in brackets. These imperial references seemed to only
apply to data and telephone cable. Our 240-volt electrical power cable did
not give any of these references to the imperial system.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
kilopascal
Sent: Thursday, 26 December 2002 15:09
To: U.S. Metric Association
Subject: [USMA:24243] Re: Millimetres, centimetres, and decimetres
2002-12-25
Brenton,
When you say 2.5 mm power cable are you describing the wire diameter or the
cross sectional area of the wire? In the case of the cross sectional area
that would be 2.5 mm�.
Wire in metric countries is sized in square millimetres. 2.5 mm� is one of
the standard sizes. I'm just wondering if in common practice, the � is
dropped from the unit.
I wish I could remember the IEC standard designating the standard sizes.
John
----- Original Message -----
From: "Brenton" <[EMAIL PROTECTED]>
To: "U.S. Metric Association" <[EMAIL PROTECTED]>
Sent: Wednesday, 2002-12-25 21:13
Subject: [USMA:24242] Re: Millimetres, centimetres, and decimetres
> I am from the building Industry (Electrician)
>
> I was taught to work solely in mm, not cms. For example, the average
office
> ceiling height was 2600. A recessed fluorescent light fitting would
replace
> a ceiling tile of 1200 x 600.
>
> Cable however was always measured in metres, i.e. a 500-metre drum of
2.5mm
> power cable, or similar. I have only come across mm represented as m
> (1.200m or 0.600m) or cm (120 cm or 60 cm) outside the building industry.
I
> never saw a representation of metres as 1.20.0.
>
> Season Greetings
> Brenton Conway
> Adelaide - Australia.
>
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf
Of
> Pat Naughtin
> Sent: Thursday, 26 December 2002 12:27
> To: U.S. Metric Association
> Subject: [USMA:24241] Re: Millimetres, centimetres, and decimetres
>
> Dear Mike,
>
> Thanks for this. It reminds me of a story* I heard in the seventies about
a
> some builders in France. They had been brought up building with metres and
> centimetres and they separated them with a decimal marker (a comma or
> virgule in their case). When they needed greater precision say for an
> architrave they simply popped in another decimal marker.
>
> Using your example of 1234 mm, this would become 1,23,4 for the builders
in
> France. In Australia, this would be 1.23.4, and it would be read as 1
metre
> 23 centimetres and 4 millimetres.
>
> I still admire the judgement of the Australian Metric Conversion Board,
who
> made the decision to use millimetres only.
>
> * I believe that this story came from the the consultative process that
> went on before the Construction Industry Committee made their decision on
> which units to use for construction in Australia.
>
> Cheers,
>
> Pat Naughtin LCAMS
> Geelong, Australia
>
> on 2002-12-25 17.16, Mike Joy at [EMAIL PROTECTED] wrote:
>
> > Pat wrote:-
> >
> > The Australian experience is that metric transition can be done in less
> > than
> > a year if you use millimetres and in about fifty years if you use
> > centimetres.
> >
> > *****************
> >
> > So true, Pat. I watched some builders build my extension 5 months ago,
two
> > extra storeys on our house, and saw how easy it was for them to measure
> > lengths of wood, etc, and cut them accurately every time to the nearest
> mm.
> >
> > They were working from plans 1:100 and had no problem with that. No
> > mistakes at all.
> >
> > There's no question that it's easier to measure and cut a length of
wood,
> > say, 1234 mm long as it's easier to remember than 'one two three POINT
> > four' cm long, and then try and work that out on your tape which is in
mm
> > anyway. Bound to lead to errors and hence wastage.
> >
> > Another main reason mm is used is because it's easier to have two units
to
> > work with than three, i.e.. mm and m, rather than mm, cm and m.
> >
> > Costings were accurate as calculations were done in mm and then rounded
up
> > as necessary.
> >
> > Folk who insist on using centimeters and Centigrade are usually those
who
> > live in the past and are not the practical type.
> >
> > Regards
> >
> > Mike
> > Perth, Australia
> >
>
>
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<< TelephoneCable.jpg >>
<< ElectricalCable.jpg >>
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