My latest find

I've managed to push back the age of the oldest computer user manual in my collection by another 42 years. SCREW PROPELLER COMPUTER Geo. McDermott 52 pages, hardbound, first edition Taylor and Carpenter, 1902 This book describes a mechanical computer with two separate rotating discs to enter variables and used to calculate the dimensions and proportions of screw propellers The last chapter is entitled "Directions for operating the computer" with 7 example problems. Unfortunately there are no pictures of the computer in the book so I'll have to wait until the book attracts the computer. :) --Doug ========================================= Doug Coward @ home in Poulsbo, WA Analog Computer Online Museum and History Center http://www.best.com/~dcoward/analog =========================================