Test set, signal level
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1978.0318.001
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- OBJECT TYPE
- THERMOCOUPLE
- DATE
- 1938–1948
- ARTIFACT NUMBER
- 1978.0318.001
- MANUFACTURER
- Cambridge Instrument Co. Ltd.
- MODEL
- RP 3700
- LOCATION
- England
More Information
General Information
- Serial #
- 55
- Part Number
- 1
- Total Parts
- 1
- AKA
- N/A
- Patents
- N/A
- General Description
- WOOD CASE WITH BRASS HINGED LID/ METAL/ PLASTIC/ GLASS/ LEATHER HANDLE
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- 40.3 cm
- Width
- 33.5 cm
- Height
- 20.7 cm
- Thickness
- N/A
- Weight
- N/A
- Diameter
- N/A
- Volume
- N/A
Lexicon
- Group
- Communications
- Category
- Telephony
- Sub-Category
- N/A
Manufacturer
- AKA
- Cambridge
- Country
- England
- State/Province
- Unknown
- City
- Unknown
Context
- Country
- Unknown
- State/Province
- Unknown
- Period
- MID 1930'S TO LATE 1960'S
- Canada
-
NIL - Function
-
USED TO PRECISELY SET THE POWER LEVEL OF A TEST OSCILLATOR. THE OSCILLATOR WAS USED TO TRANSMIT PRECISE POWER LEVELS INTO A TELEPHONE CIRCUIT OR CARRIER SYSTEM. A SIMILAR MEASURING DEVICE AT THE DISTANT END ALLOWED ACCURATE SETTING OF TRANSMISSION LEVELS ON LONG DISTANCE CIRCUITS. - Technical
-
AN EARLY EXAMPLE OF PRECISE TRANSMISSION TESTING DEVICES. THESE DEVICES BECAME NECESSARY WHEN CARRIER SYSTEMS AND LONG DISTANCE REPEATERS (GAIN DEVICES) WERE USED ON TELEPHONE CIRCUITS. SIMILAR THERMOCOUPLE METERS WERE USED TO MAINTAIN J AND K CARRIER SYSTEMS IN NORTH AMERICA. - Area Notes
-
Unknown
Details
- Markings
- ON CASE: TOP PLASTIC PLATE:'WARNING/ CLAMP METER MOVEMENT/ BEFORE/ MOVING TESTER/ OR CLOSING LID'; CENTRE FRONT BASE PLATE: 'TESTER RP 3700/ DGM RPW 3700'; 'T4903' WRITTEN ON TOP LEFT CORNER; CIRCULAR ORANGE STICKER WITH LISTED REDUNDANT' WRITTEN AFFIXED TO THE RIGHT SIDE/ OPERATION INSTRUCTION SHEET AFFIXED TO INSIDE OF LID/ ON INSTRUMENT: PLASTIC PLATE: 'WARNING/ CLAMP METER MOVEMENT/ BEFORE MOVING TESTER/ OR CLOSING LID'; ON FACE OF GALVANOMETER NEEDLE: 'CAMBRIDGE INSTRUMENT CO. LTD. ENGLAND/ NO. L 303 471/ PATTERN LY' & SCALE POINTS: 'ZERO, MAX/ A.C. INPUT & CALIBRATE' & 'CLAMP/ ADJUST ZERO/ FREE' ADJUSTOR FOR NEEDLE.
- Missing
- N/A
- Finish
- VARNISHED WOOD CASE/ TOP OF INSTRUMENT PAINTED GREYISH- GREEN
- Decoration
- MORTICE & TENON CASE JOINERY
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Cambridge Instrument Co. Ltd., Test set, signal level, between 1938–1948, Artifact no. 1978.0318, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1978.0318.001/
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