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Description found in Archives

Hon. C.D. Howe watches a male scientist test the curve of a lens by interference fringes at the Instruments Division at the Canadian Arsenals Ltd. optical plant. 


Apr. 1941


Toronto, Ont.

Place of creation

No place, unknown, or undetermined

1 photograph
Negative Film B/W - cellulose nitrate
Graphic (photo)
90: Open
Item no. (creator)
WRM 722
Other accession no.
1971-271 NPC

Terms of use

Credit: National Film Board of Canada. Photothèque / Library and Archives Canada /
Restrictions on use: nil
Copyright: Expired

Additional name(s)

Photographer: Unknown.

Additional information

Series title

Signatures and inscriptions
"OPTICAL INSTRUMENTS - TORONTO, ONT. All glass surfaces in optical instruments are worked to such a high degree of accuracy that only light waves are sufficiently delicate as a method of measurement. Hon C.D. Howe watches one of the scientists to test the curve of a lens by interference fringes. (Instruments Division, Canadian Arsenals Ltd., Toronto, Ont.)


Other system control no.