The Curious Life of Saint Pudalia
  • Home
  • EPHEMERA
  • WHEELS
  • COLLAGE
  • ABOUT
  • ODDS & ENDS

The desire for knowledge, like the thirst for riches,
​increases ever with the acquisition of it.

Dial-A-Trig

9/24/2016

 
The Dial-A-Trig wheel is your guide to triangles. I don't know anything more than that about trigonometry, so you're on your own there. This wheel is 7.75 by 9 inches and someone punched it for insertion into a notebook, which means this wheel got some use. And look! When this was first printed, the patent was pending. It appears Joseph Peter Simini had to have a rubber stamp made to correct the pending part.

It looks like this is pretty easy to use. I guess.

Comments are closed.

    Author

    I have a cat.

    Archives

    September 2019
    September 2018
    August 2018
    July 2018
    May 2018
    January 2018
    July 2017
    April 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016
    June 2016
    May 2016
    April 2016

    Categories

    All

    RSS Feed

Picture
Proudly powered by Weebly
  • Home
  • EPHEMERA
  • WHEELS
  • COLLAGE
  • ABOUT
  • ODDS & ENDS