Calculator Manual, DIGI-matic
Hand held calculator Simpsons Sears Model Digi-matic 8 Model 41030, S/N 135988. This calculator is...
Calculators Manual
In 1642, Blaise Pascal is credited with designing one of the earliest forms of a...
Altimeter, E.R. Watts & Son
Brass altimeter, 8 cm in diameter x 3 cm depth with a glass cover. The...
Altimeter, Thommen Everest
Hand held THOMMEN EVEREST pocket altimeter. This altimeter is made of leather plastic and metal...
Altimeter, American Paulin Systems
Altimeter, Micro, Model M-2, s/n NS1201K, with Manual "American Paulin System, Altimetry Manual"
Altimeter, Topley
This altimeter is marked “No. 8070, Compensated, The Topley Company, “D.L.S. special.” It comes with...
Altimeter, Short & Mason
F.2453. This altimeter is calibrated in feet and inches of mercury. Pocket watch style brass...
Altimeter, Pennwalt Wallace & Tiernan
This altimeter is one of a pair. They are marked “Pennwalt” “Wallace & Tiernan” Model...
Altimeters
Altimeters measure the height above sea level by measuring barometric pressure. Altimeters and barometers are...
Hugh Pearson Photograph Collection
Collection of photographs taken by Hugh Pearson, D.L.S, A.L.S.