Mirror, galvanometer
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1998.0241.001
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- OBJECT TYPE
- VIBRATION/REPLACEMENT/60-600~
- DATE
- 1930–1939
- ARTIFACT NUMBER
- 1998.0241.001
- MANUFACTURER
- Cambridge Instrument Co. Ltd.
- MODEL
- Unknown
- LOCATION
- Cambridge, England
More Information
General Information
- Serial #
- N/A
- Part Number
- 1
- Total Parts
- 4
- AKA
- N/A
- Patents
- N/A
- General Description
- .1-.3 METAL (?) MIRROR; CELLOPHANE PAPER DISK/.4 PAPER BOX; WAX SEAL REMNANT
Dimensions
Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.
- Length
- 3.4 cm
- Width
- 3.4 cm
- Height
- 1.4 cm
- Thickness
- N/A
- Weight
- N/A
- Diameter
- N/A
- Volume
- N/A
Lexicon
- Group
- Energy-electric
- Category
- Measurement
- Sub-Category
- N/A
Manufacturer
- AKA
- Cambridge
- Country
- England
- State/Province
- Unknown
- City
- Cambridge
Context
- Country
- Canada
- State/Province
- Ontario
- Period
- THESE MIRRORS NEVER USED; THIS TYPE/STYLE PROBABLY USED 1920S+
- Canada
-
PART OF A COLLECTION OF PHYSICS LABORATORY AND CLASSROOM DEMONSTRATION APPARATUS FROM MCMASTER UNIVERSITY. FOUNDED IN 1887 MCMASTER WAS ORIGINALLY A BAPTIST INSTITUTION, AND WAS LOCATED IN TORONTO. IN 1930 THE UNIVERSITY AND ITS STUDENT POPULATION OF 500 WAS MOVED TO HAMILTON, ONT. (REF. 1) - Function
-
USED AS REPLACEMENTS FOR BROKEN OR DAMAGED MIRRORS ON VIBRATION GALVANOMETERS. - Technical
-
THE MOST SENSITIVE GALVANOMETERS AND SOME ELECTROMETERS USE A PIECE OF FERROUS METAL AFFIXED TO A SMALL MIRROR SUSPENDED ON A FINE WIRE. THIS WIRE WAS VERY VULNERABLE TO VIBRATION OR SHOCK, OR TO DAMAGE CAUSED BY TOO HIGH A CURRENT BEING APPLIED TO IT. THUS, THE SUSPENSION WIRE AND MAGNET/MIRROR HAD TO BE REPLACED ON A REGULAR BASIS. IT WAS A TEDIOUS AND PAINSTAKING PROCEDURE. (REF. 1) - Area Notes
-
Unknown
Details
- Markings
- Some text faintly visible on paper disks; one reads in part "..E DRY/...NG CO. LTD."
- Missing
- NONE.
- Finish
- MIRROR SEALED WITHIN OPAQUE GOLD-COLOURED CELLOPHANE DISK
- Decoration
- N/A
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Cambridge Instrument Co. Ltd., Mirror, galvanometer, between 1930–1939, Artifact no. 1998.0241, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/item/1998.0241.001/
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