Flat, optical

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Ingenium, 1996.0648.001
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OBJECT TYPE: COMPARATOR/SURFACE
DATE: 1943
ARTIFACT NUMBER: 1996.0648.001

MANUFACTURER: NATIONAL PHYSICAL LABORATORIES
MODEL: Unknown
LOCATION: Teddington, England

More Information

General Information

Serial #: N/A
Part Number: 1
Total Parts: 3
AKA: N/A
Patents: N/A
General Description: .1 &.2 GLASS;.3 WOOD WITH METAL HARDWARE WITH VELVET LINING

Dimensions

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

Length: 14.8 cm
Width: 9.2 cm
Height: 2.7 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Astronomy
Category: Miscellaneous
Sub-Category: N/A

Manufacturer

AKA: NATIONAL PHYSICAL
Country: England
State/Province: Unknown
City: Teddington

Context

Country: Worldwide
State/Province: Unknown
Period: THESE FLATS WERE MADE IN 1943 & WERE IN DONOR'S POSSESSION UNTIL GIVEN TO NMST IN 1996
Canada: USED BY DONOR, JOHN CORBY, FORMER CURATOR OF INDUSTRIAL TECHNOLOGY AT NMST, WHO USED THE FLATS WHEN EMPLOYED AS A GAUGE MAKER AT THE NPL (NATIONAL PHYSICAL LAB) AT TEDDINGTON, ENGLAND DURING WWII. AT THE TIME HE WAS PRODUCING GAUGES FOR PRODUCTION LINES IN WHICH MUNITIONS WERE MADE. [REF 2]
Function: USED IN PAIRS IN CONJUNCTION WITH A MONOCHROMATIC LIGHT SOURCE TO TEST THE FLATNESS OF A THIRD SURFACE. [REF 1]
Technical: THESE FLATS ARE ACCURATE TO APPROX 0.00001". THEY WERE EMPLOYED INPRODUCTION OF GAUGES SUCH AS JOHANNSEN GAUGES WHICH ARE IN TURN USED FOR MEASURING PRECISE THICKNESSES OR ANGLES. [REF 1]
Area Notes: Unknown

Details

Markings: NO MARKINGS
Missing: COMPLETE
Finish: .1 &.2 UNCOLOURED GLASS/.3 STAINED AND VARNISHED WOOD; PURPLE VELVET
Decoration: N/A

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NATIONAL PHYSICAL LABORATORIES, Flat, optical, 1943, Artifact no. 1996.0648, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1996.0648.001/

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