Vintage Weston Model 1 Tachometer Unit / DC Voltmeter in Wooden Case – Needle Moves, Calibrated 1963

Vintage Weston Electrical Instrument Corporation (Newark, N.J., U.S.A.) portable tachometer unit / direct-current voltmeter housed in its original wooden carrying case with leather handle.

This is the indicating instrument from a DC tachometer-generator system. It reads voltage proportional to RPM and is meant for use with a calibration chart. Clearly marked as a tachometer unit and not an ordinary voltmeter.

Key markings:

Model 1, No. S 37220

“THIS IS A TACHOMETER UNIT”

“WESTON DIRECT CURRENT VOLTMETER”

“TACH. UNIT”

“SEE CALIBRAT’N CHART FIRST”

“THIS IS NOT AN ORDINARY VOLTMTR. MAX. 8.9 VOLTS PER 1500 REV”

Additional serial marking M000357

Calibration sticker dated 2/11/63

Patent plate lists dates from 1888–1901

Case dimensions: approximately 6¾″ × 7½″ × 4″.

Early-to-mid 20th century (patents through 1901).

The 1963 calibration sticker shows it was still in service and calibrated then. Needle moves freely. Case has normal age-related wear, scratches, and patina; leather handle is present. Sold as-found — mechanism is responsive but untested for accuracy.

Ideal for collectors of vintage industrial instruments, electrical history, steampunk, or machinery-related items. Please review all photos for exact condition.