Test Equipment & Meters (c. 1920-1980)

Triplet 3423 Tube Tester 

This tube tester was released by Triplet in 1959. It was used to test the functionality of Vacuum tubes, which were used mostly in radios and televisions back then.

Source: Estate Sale

Bell & Howell Model 34

This is a Bell & Howell Model 34 Oscilloscope released around 1970. Oscilloscopes are used for testing the electricity in something.

Source: Estate Sale

General Electric Ammeter 

This Ammeter was a meter produced by General Electric. It is dated "1948" on the certificate attached to the lid. I got this at an Estate sale of a person who used to work at GE, (see the Triplett Tube Tester I got there, too), and was probably awarded this in the 1940's. 

Source: Estate Sale

Taylor Tycos Recording Barograoh Model 2315 

The Taylor Tycos Recording Barograph Model 2315, also known as the Tycos Micro-Barograph, represents a pinnacle of early 20th-century meteorological precision, born from a partnership between the American Taylor Instrument Companies and the British firm Short & Mason. Although Taylor Brothers acquired Short & Mason in 1900, they continued to market these high-quality British-made instruments under the "Tycos" brand—a name used exclusively from 1908 until 1932. The Model 2315 was a "micro-barograph," a specialized high-sensitivity recording barometer that used a stack of fourteen extremely thin, partially evacuated metal capsules (aneroid cells) to amplify atmospheric pressure changes. This stack was connected via a complex system of brass levers to a pen arm that inscribed a continuous record onto a paper chart wound around a clockwork-driven brass drum. Retailing for the substantial sum of $250.00 in the 1920s (roughly $4,500 today), the Model 2315 was a staple in high-end laboratories, weather bureaus, and the "boardrooms" of high-altitude industries, prized for its ability to track minute barometric fluctuations over a seven-day period.

Source: Elephant's Trunk Flea Market

Frequency Counters (Hewlett Packard 5383A & Heathkit)

A frequency counter released by Hewlett Packard around 1970. A frequency counter tests the frequency of electricity. Also seen here is a frequency counter made by Heathkit in 1977. 

Source: Estate Sale