A 19th Century electro-static cylinder machine, with glass cylinder, leather friction pad and turning handle on mahogany stand - 14¼in.wide; a 19th Century vacuum pump with makers plaque for WELCH Chicago , with cast iron pump handle, single cylinder and bell jar; and a minimum/maximum thermometer signed NEGRETTI & ZAMBRA LONDON in fitted velvet lined case (3)
A 19th Century electro-static cylinder machine, with glass cylinder, leather friction pad and turning handle on mahogany stand - 14¼in.wide; a 19th Century vacuum pump with makers plaque for WELCH Chicago , with cast iron pump handle, single cylinder and bell jar; and a minimum/maximum thermometer signed NEGRETTI & ZAMBRA LONDON in fitted velvet lined case (3)
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