A Remedial Introduction to "Politics" for Newly-Enfranchised Women in the U.K. (1918) #voting https://t.co/ws8wOsiIrE pic.twitter.com/inYQCHjoXu
— JF Ptak (@ptak) April 8, 2019
from http://twitter.com/ptak
on: April 08, 2019 at 01:52PM
A hydrogen gas sidecar, 1917: #motorcycle #engineer https://t.co/h9K9khd8VJ
— JF Ptak (@ptak) February 12, 2019
from http://twitter.com/ptak
on: February 12, 2019 at 04:11PM
Gravitation conquered at last. From "Science and Invention", October 1927. pic.twitter.com/WDzWOCwS6s
— JF Ptak (@ptak) November 5, 2018
from http://twitter.com/ptak
on: November 05, 2018 at 01:45PM
It is all fun and games until you have to land…image via Wikicommons, being the cover of the September 1922 issue of "Popular Science" magazine. #helicopter #aviation pic.twitter.com/m1gj0WcLQx
— JF Ptak (@ptak) October 13, 2018
from http://twitter.com/ptak
on: October 13, 2018 at 09:15AM
From the portfolio of Dr. Odd: making toy soldiers out of cigarettes. https://t.co/fQ2D0B9cwF
— JF Ptak (@ptak) October 10, 2018
from http://twitter.com/ptak
on: October 10, 2018 at 10:46AM
Cross section of a dirigible, from "Popular Mechanics", 1925. #aviation pic.twitter.com/35yM1DFZSN
— JF Ptak (@ptak) August 22, 2018
from http://twitter.com/ptak
on: August 22, 2018 at 06:10PM
One of the earliest computer games: tic tac toe, by Sandy Douglas, on Cambridge's EDSAC, 1952. #histstm https://t.co/Ze1z2BlWIF pic.twitter.com/YvxONtawO5
— JF Ptak (@ptak) August 22, 2018
from http://twitter.com/ptak
on: August 22, 2018 at 08:29AM
Step father-in-law's list of campaigns with 2nd cav on his discharge papers from October 1945. Stunning, really. pic.twitter.com/ATRdQfts0S
— JF Ptak (@ptak) July 14, 2018
from http://twitter.com/ptak
on: July 13, 2018 at 11:41PM
— JF Ptak (@ptak) June 7, 2018
from http://twitter.com/ptak
on: June 07, 2018 at 11:42AM
A glorious set of astronomical gearworks (printed 1820) #astronomy #histSTM https://t.co/h9IBISMTn8 pic.twitter.com/SZZi6zDloO
— JF Ptak (@ptak) June 7, 2018
from http://twitter.com/ptak
on: June 07, 2018 at 11:12AM