A rare, Italian Slide Rule by Mo. Matte. The Regolo Di Convergenza (Artllery) ruler is housed in a beautiful wood case. The ruler information from the Slide Rule Museum:
Front Scale: 48cm// b [ d , β(1600-3199), β(1600-1) ϒ] b/D \\ 1:25000
Back Slide: [ Sen.ε, Cos.ε, tg.ε, L ]
Back: Instructions (Italian)
Interesting World War 2 era tool; the ruler measures approximately 20 3/8" long and is in good vintage condition. The celluloid covered mahogany ruler has some staining and the slide is clear. The wood box has brass hardware and the name of the ruler on the cover. Beautiful presentation box.
