Galvanometer

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Ingenium, 1968.0933.001
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OBJECT TYPE: TANGENT
DATE: 1885
ARTIFACT NUMBER: 1968.0933.001

MANUFACTURER: Greeley, E.S. & Co.
MODEL: Unknown
LOCATION: New York, New York, United States of America

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 1
AKA: N/A
Patents: N/A
General Description: BAKELITE BASE & COIL CASE; COPPER MAGNET WIRE COIL; BRASS HARDWARE & METER (COMPASS) FACE; MAGNETIZED STEEL POINTER; GLASS COMPASS WINDOW; SILVER COMPASS CIRCLE.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length: 21.7 cm
Width: 18.8 cm
Height: 22.0 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Communications
Category: Telegraphy
Sub-Category: N/A

Manufacturer

AKA: Greeley
Country: United States of America
State/Province: New York
City: New York

Context

Country: Europe
State/Province: Unknown
Period: THIS TYPE OF GALVANOMETER USED C. 1885- 1900.
Canada: Unknown
Function: TO MEASURE THE CURRENT OF AN ELECTRIC CIRCUIT.
Technical: VERY GOOD EXAMPLE OF EARLY ELECTRICAL MEASURING EQ. TANGENT GALVANOMETER SO CALLED BECAUSE THE STRENGTH OF THE CURRENTS, IN PASSING THROUGH THE COIL, WILL PRODUCE THE VARIOUS DEFLECTIONS WHICH ARE DIRECTLY PROPORTIONAL TO THE TANGENTS OF THE ANGLES OF DEFLECTION OF THE NEEDLE. (REF.2 P.348.)
Area Notes: Unknown

Details

Markings: " The E.S. Greeley & Co./ New York " incised on compass face. Compass circle divided 90-0-90 & 100-0-100. Switch blocks labelled " 200/50/10/1/0 " & " 50/00 5/00 1/0". Two sets of blocks labelled "G" & "R", respectively. [Ground & Resistance]
Missing: NIL. ONE SMALL SCREW MISSING FROM ONEBRACKET SUPPORTING COMPASS. ONE SWITCH PIN IS OF DIFFERENT SIZE & FINISH- PRESUMABLY NOT ORIGINAL.
Finish: SHUNT BLOCKS NATURAL BRASS. SWITCH PINS HAVE NATURAL BRASS FINISH WITH BLACK OR BROWN BAKELITE HANDLES. ADJUSTABLE FEET ARE NATURAL BRASS, WITH KNURLED EDGES. CLEAR GLASS WINDOW OVER COMPASS.
Decoration: N/A

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If you choose to share our information about this collection object, please cite:

Greeley, E.S. & Co., Galvanometer, circa 1885, Artifact no. 1968.0933, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1968.0933.001/

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