Oversize 4-ft B&W Demonstration School Slide Rule. Made in the Mid-Century era of 3 layers of masonite boards riveted together with five rubber feet on the back as well as tabs for wall mounting. According to the International Slide Rule Museum, the Welch models were the only training slide rules with a black background and white scales.
Dimensions are 9 in h x 47.75 in w x 1 in d. Condition is good, with some small chips out of corners. Please call or email for a detailed condition report.

See description and photos for condition. Please email or call for a more detailed condition report. We grade on a scale from excellent, very good, good, fair, to poor; that said, all lots are sold in as is condition at time of sale, and condition listings are given as a courtesy for guidance only and should be evaluated by personal inspection by the bidder.

9 x 47.75 x 1 in