Hi Peter

	It has been a long time since I have used or even looked at one, but
isn't this just an architect's rule?
	That's the kind of bell it rings for me anyway :)

Joe

-----Original Message-----
From: oldtools-bounces@r...
[mailto:oldtools-bounces@r...] On Behalf Of Peter Huisman
Sent: Monday, September 10, 2007 8:17 PM
To: pwomack@p...; oldtools@r...;
clintwarren@c...
Subject: [OldTools] Re: ID: strange scaling ruler

Galoots all,

Bugbear's post, and the rapid replies, prompted me to fossick amongst my 
firewood and arn for a lost 'find'.

Pics here:

http://picasaweb.google.com/ausiewood/ScaleRuleAGThornton

Clint's reply made me look a little more closely at the grads on this 
nice looking rule. It shows the increasing number (quantity if you 
will), of grads as you read the rule from left to right. For example, 
see the 1/8th scale (3rd picture) - it shows that for 1" there are 8 
segments. Notice that the grads start one to the right at 0! The number 48
below and between the 0 and 2 is the total number of 1/4s 
as read from the other end.

The rule has grads for:
1/8, 1/4, 3/8, 1/2, 3/4, 1", 1"1/2, 3"

At their start, all scales also have smaller grads. As you will see in 
the 3rd pic, the first 1/8th grad is further divided into six units. All 
other smaller grads are multiples of six.

Any ideas gentlemen?

PeterH in Perth

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