galvanometer
Date1929
Inventory Number1997-1-1041
ClassificationAmmeter
Subject
Maker
Rawson Electrical Instrument Company
1918 - 1968
Cultural Region
Place of Origin
Dimensions5.3 × 12.5 × 11 cm (2 1/16 × 4 15/16 × 4 5/16 in.)
blue board box: 19.5 × 19.5 × 13.5 cm (7 11/16 × 7 11/16 × 5 5/16 in.)
blue board box: 19.5 × 19.5 × 13.5 cm (7 11/16 × 7 11/16 × 5 5/16 in.)
Material
DescriptionA black metal box with a display and controls on the front. The front of the box has a window, curved along the top, angled in at the sides and straight along the bottom, through which the instrument scale is displayed. The scale is arc-shaped, with increments marked 0-15 along the top of the scale. The display has a needle shaped pointer. Below the scale is a reflective strip.
Below the display is a cylindrical protrusion, centered on the front face of the instrument, with two plastic control knobs, labeled "ZERO" and "CLAMP." The "CLAMP" knob has a simple arrow inscribed on it. Centered above the two knobs is an emblem, a shield-shape with the letter "R" inside.
Two cylindrical knobs of unequal size protrude from the bottom of the instrument, both with edges knurled in different patterns.
Below the display is a cylindrical protrusion, centered on the front face of the instrument, with two plastic control knobs, labeled "ZERO" and "CLAMP." The "CLAMP" knob has a simple arrow inscribed on it. Centered above the two knobs is an emblem, a shield-shape with the letter "R" inside.
Two cylindrical knobs of unequal size protrude from the bottom of the instrument, both with edges knurled in different patterns.
Signedprinted below scale: MICROAMPERES / NO. 5713 (the number is handwritten) / RAWSON ELECTRICAL INSTRUMENT CO.
Inscribedunmarked white sticker: to 80, DW [David Wheatland]
FunctionA very precise ammeter or galvanometer, with a range 0-15 milliamperes.
Rawson Electrical Instrument Company
Date: circa 1930
Object number: 0428
Gebrüder Haff
Date: 1960-1969
Accessories: plush-lined, hard green case
white card with instrument information in case
Object number: 1999-1-0005
Weston Electrical Instrument Corporation
Date: 1894
Accessories: Weston portable multiplier (0279b); standardization certificate on back of lid
Object number: 0279a
Beckman Instruments, Inc.
Date: circa 1955
Accessories: instructions attached to underside of box lid
Object number: 1996-1-0276
Jewell Electrical Instrument Company
Date: 1915-1929
Object number: 1997-1-0324
General Electric Company
Date: late 19th-early 21st Century
Object number: 1997-1-1077
