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Principles of electro-medicine, electrosurgery and radiology - a practical treatise for students and practitioners. With chapters on mechanical vibration and blood pressure technique (1917) (14574401697)
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Government discovers method to preserve film. Scratch resistance, film, particulary the emulsion side, may become damaged through scratching. D. Levinsky of the Bureau is using an instrument which tests the resitance of a film by measuring the width of a scratch produced by a diamond point under a given load. Another method is to put a piece of film in a bottle of sand, revolve the bottle a certain number of times, then measure the haxiness developed. Many commercial treatments designed to increase the hardness of the emulsion have been investigated, 7838
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Summary
Fitzroy Island Light optical apparatus, 1917
Public domain photograph of laboratory, scientist, work of US government, free to use, no copyright restrictions image - Picryl description
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Tags
automatic lamp changers
black and white photographs of lighthouses in australia
fitzroy island light
images from the national archives of australia series a 6247
interiors of lighthouses in australia
australia
Date
1917
Source
National Archives of Australia
Link
Copyright info
Public Domain