retrotech

An intriguing write-up on a real project to develop a “pneumatic” subway in New York City in the late 19th Century. Before its time!

A collection of over 2000 USGS topographic maps dating from the 1880s to the 1950s. The collection covers all of New England, and parts of Virginia, West Virginia, and Ohio.

“On Guard! The Story of SAGE” The Internet Archive provides downloadable versions of an IBM film on the “Semi Automatic Ground Environment” which was the first attempt at a computer assisted air defence command.
Coincidentally, the earliest “PC” that I wanted to buy was called a “sage”. That sage company departed the PC wars before they really got started.