audio attenuator
Date1940-1950
Inventory NumberWJ0526
ClassificationAttenuator
Subject
Maker
Daven Radio Company
1924 - c. 1970
Cultural Region
Place of Origin
Dimensions15.4 × 23.7 × 16.7 cm (6 1/16 × 9 5/16 × 6 9/16 in.)
Material
DescriptionThe top and bottom covers are screwed and bolted on the frame of the instrument. The front panel contains a decibel scale in the center ranging from 0 to 40 decibels in increments of 2. A knob adjusts the decibel level from low to high. There are two "In" connectors on the lower left corner and two "Out" connectors on the lower right corner of the front panel. There is a "INT 500, EXT" switch to the right of the decibel scale, a fuse to the left, and a multiplier knob with three settings: 0-30-60.
Signedon decibel dial: The Daven Company / Newark, N.J. / U.S.A.
Inscribedon the bottom panel, twice: INPUT 500 OHMS
on front panel: Harvard / Psychological / Laboratory
on decibel dial, stamped: Type T118
Ballantine Laboratories, Inc.
Date: copyright 1953
Accessories: Instruction booklet, see 1998-1-1372b
Object number: 1998-1-1372a
Ballantine Laboratories, Inc.
Date: 1947-1960
Accessories: one small plastic card: "Use the Ballantine voltmeter. . .".
Object number: 2006-1-0065
Raytheon Manufacturing Company
Date: Copyright 1966
Accessories: sheath
Object number: 2004-1-0016
Date: circa 1935
Accessories: four brochures for the Lightning Calculators, types A - D in library (Lib.4598a-d)
Object number: 1998-1-1375
Westinghouse Electric & Manufacturing Company
Date: 1890-1930
Object number: RS0517
Cruft Laboratory, Harvard University
Date: ca. 1920-1925
Object number: RS0912
General Radio Company
Date: 1960-1970
Accessories: operation manual
Object number: 1999-1-0055
Triplett
Date: 1930-1950
Accessories: plain cardboard box fitted for this meter; small sealed envelope of hardware
Object number: WJ1276
General Radio Company
Date: 1926-1930
Accessories: 2 batteries (removed during FAE inventory).
Object number: RS0342
Siemens & Halske AG
Date: circa 1900
Object number: 0275a,b
General Radio Company
Date: circa 1970
Accessories: calibration chart, included in box.
Object number: 2003-1-0118
Decibel Products, Inc.
Date: mid 20th-late 20th Century
Accessories: paper sleeve; instruction sheet (with instrument)
Object number: 1997-1-2033