Original 1943 electrical trade vintage ad for J-B-T INSTRUMENTS, INC.  Main office and plant was located at 459 Chapel Street, New Haven, CT.

Manufacturers of Vibrating Reed Frequency Meter. Model 33-F for 400 Cycles.

Sound your "A". We're going to tune a 400 cycle meter.

Pitch pipes or ordinary tuning-forks are good enough for musical instruments where human error is expected, but not for electrical instruments. Tuning-fork electronic oscillators of our own design are used to calibrate J-B-T Vibrating Reed Frequency Meters because this is the most scientific, most accurate method we know of. Reeds are calibrated twice - once before assembly and later in the completed instrument. Before shipment each instrument is given a final check for accuracy of resonance.

Has product images, illustrations, descriptions, applications and specifications to provide extensive product details.

Unbound from a 1943 electrical engineering magazine, this unique old one-page advertisement would display beautifully matted and framed. Nice graphics. World War 2 propaganda. A fabulous addition to your retro electrical library.