THE GREAT MULLARD MAGIC BLOG — leica covering

   I just love this advert from 1926 for Ebonite from Trelleborgs which is only sold by high class dealers.  That quaint phrase puts me in mind when a military radio collecting friend and I were branded high end dealers but I digress.   Some of you - those with or even without a Brownie crystal set may wonder precisely what ebonite is........well....   Ebonite is a brand name for very hard rubber invented by Charles Goodyear in 1842 that is resistant to solvents, acids, alkalis and halogens whilst stable between ambient temperatures of -10º to +90ºC with an expansion coefficient 7...