pressure gauge calibrated from 0 to 100 PSI
Date: ca. 1940-1958
Inventory Number: 1998-1-1503
Classification: Pressure Gauge
Subject:
Cultural Region:
Place of Origin:
Dimensions:
4.3 x 5.7 cm (1 11/16 x 2 1/4 in.)
Accessories: "BARRISTER" cigar box
Description:
Pressure gauge in circular wood casing with face and needle behind glass. Scale, marked "pressure" is in an arc formation in the top half of the face and numbered from 0 to 100 PSI, marked 0, 25, 50, 75, 100. 3 tick marks between 0 and 25, 4 between the each of the rest of the numbers.
Metal needle, possibly iron, pivots on a copper rivet fastened at the of the gauge face. Tip of the needle is in the shape of a diamond with concave sides.
A brown material, possibly dirt, is on the edges of the glass between the glass and wood.
Circular frame around the face is raised on the inside and rounded.
Metal needle, possibly iron, pivots on a copper rivet fastened at the of the gauge face. Tip of the needle is in the shape of a diamond with concave sides.
A brown material, possibly dirt, is on the edges of the glass between the glass and wood.
Circular frame around the face is raised on the inside and rounded.
Signedprinted in black on face: ROCHESTER MANUFACTURING CO. INC.
Inscribedprinted in black on face: PATENTS PENDING. MADE IN USA;
in center of face: PRESSURE;
on white label on face: 075
in center of face: PRESSURE;
on white label on face: 075
FunctionGauge is most likely a Bourdon gauge, which operates under the principle that an elastic tube will straighten with an increase in pressure. A Bourdon gauge consists of a thin-walled metal tube curved around the gauge. This is connected to a pair of metal joints that connect in turn to a lever with gear teeth on the other end that nest in the central gear that is connected to the pointer. When the tube begins to straighten due to an increase in pressure, it moves the lever, which moves the dial.
Curatorial RemarksCircular label and number are of R. Forsberg series. #075
The storage dimensions were not those of a cigar box. 4.5 height and 6 cm width and depth were just round-ups.
The frame obscures some of the writing on the bottom of the face.
This could also be a diaphragm gauge. Not sure yet.
The storage dimensions were not those of a cigar box. 4.5 height and 6 cm width and depth were just round-ups.
The frame obscures some of the writing on the bottom of the face.
This could also be a diaphragm gauge. Not sure yet.