Re: 120 vent lever, picture?

Posted by Owen_Dyneto On 2009/3/8 17:36:54

A bit of trivia. "Tenite" is a generic category of early thermoplastics known for low cost and good molding and casting properties, kind of the plastic analog to white metal. UV-stabilizing technology was primitive a best in prewar years so tenites of that era have poor resistance to sunlight. I believe but not certain that tenite was either developed or perhaps commercialized by the Eastman Co. for use as a replacement for the glass plate formerly used as a substrate for photographic emulsions. In any case they are formed by reaction of cellulosic materials (usually wood pulp) and a corresponding acid like acetic (making cellulose acetate). Reacting with nitric acid gives nitro-cellulose, well-known for other properties.