Experimental apparatus, comprising tripod, water bath, bunsen burner, retort clamps and part of a kynograph tracer, used by Sir Henry Dale, 1920-1930 Experimental apparatus used by Sir Henry Dale, 1920-1930 1920-1930
"Rathbone" electric dental vulcanizer, No. 354, by the Dental Manufacturing Co., London, 1930-1950 "Rathbone" electric dental vulcanizer