Calculator, Odhner

Serial No. 39-289679, Desk top mechanical calculator that belonged to Ted Rippon, ALS. It is...

Calculator, DIGI-matic

Hand held calculator Simpsons Sears Model Digi-matic 8 Model 41030, S/N 135988. This calculator is...

Calculators

In the early 1970s, “handheld” or “pocket” calculators and computers were introduced. They were small...

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 Altimeter

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...