Obsolete tools

[mklotz]

Saw this in a post over on Chaski. All you old pharts who dream of going back in time to a day when there were no computers or anything electronic in the drafting room will love it...

Museum of Obsolete Drafting Technology

https://www.moodt.org/exhibis/

[Philip Davies]

I can’t show you the link, but I found it on Pinterest: Trident Tomahawk trisector.
I shall be using my draughting equipment this week, but I would like to have a pair of compasses that retain their radius!

[mklotz]

I can’t show you the link, but I found it on Pinterest: Trident Tomahawk trisector.
I shall be using my draughting equipment this week, but I would like to have a pair of compasses that retain their radius!

Here you go...

https://en.wikipedia.org/wiki/Tomahawk_(geometry)

The compass with LH-RH thread to adjust spacing holds its setting very well, e.g...

https://www.amazon.com/Staedtler-Com...3938532&sr=8-8

[ipsumental]

Thanks. good photo. I've been looking for that instrument. What's it called? For lack of a better, I refer to it as a "scissor equidistancer". I'd make one, but...

[owen moore]

Reminds me of a common sheet metal/aircraft tool called a "rivet spacer." Very handy when laying out a long row of equidistant holes or spaces.

[owen moore]

There is also a compass/divider that works somewhat like this which describes the "Golden Ratio."

[bruce.desertrat]

There is also a compass/divider that works somewhat like this which describes the "Golden Ratio."

Here's a plan to make one of those. https://cdn.woodsmith.com/files/issu...ge-drawing.pdf

[bruce.desertrat]

Saw this in a post over on Chaski. All you old pharts who dream of going back in time to a day when there were no computers or anything electronic in the drafting room will love it...

Museum of Obsolete Drafting Technology

https://www.moodt.org/exhibis/

I remember laboriously (VERY laboriously) lettering the figure captions for my 7th grade science project with my dad's Leroy set. I think I spent more time on that than the project itself!

[mklotz]

Here's a plan to make one of those. https://cdn.woodsmith.com/files/issu...ge-drawing.pdf

Seems a waste of time to me. All one really needs is a tape measure and a calculator.

The Golden Ratio is the solution to the equation:

1/X = X-1

or in canonical form:

X^2 - X - 1 = 0

which has the (positive) solution:

X = [ 1 + sqrt(5) ] / 2

[jott]

Take a look at a Gerber variable scale for scaling drawings, reading values off a map or graph.
Gerber variable scale | Objects | The Collection of Historical Scientific Instruments
https://www.planetanalog.com/whats-a...riable-scale/#