A black box with a blue velvet lining contains a black instrument. The instrument has a large glass-fronted dial on its surface indicating rotations per minute. There are six other small objects within the case. These are spindles and tips to bring the tachometer into contact with a rotating shaft.
Accession Number: 2016.phlt.1.102.1-8
Primary Materials: Steel, Rubber, Glass
The instrument has a serial number embossed on its back surface. “88247”
It has the letters “PHYS HYG” inscribed onto its back surface.
Box: Length = 10, Width = 12.7, Height = 17.5.
This instrument measures rotational speed.
Very Good: The surfaces of the instrument and case are slightly worn.
Boulin Instrument Corporation. New York, New York.
Date of Manufacture:
Additional Information and References: