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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 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...Quote:
Originally Posted by Philip Davies
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
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...
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.
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.pdfQuote:
Originally Posted by owen moore
Quote:
Originally Posted by mklotz
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!
Seems a waste of time to me. All one really needs is a tape measure and a calculator.Quote:
Originally Posted by bruce.desertrat
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
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/#
Golden ratio compasses are being sold on Amazon as a beauty aid for makeup.
Not sure what they are doing with them, something to do with eyebrows.
:headscratch: