Details
H. TINSLY & CO., London
A Vernier Potentiometer, with variable resistance dials and other meters mounted in vulcanite, in mahogany plinth case -- 24 3/8in.(62cm.)wide; and a Silvertown telegraph needle, in brass case (2)
A Vernier Potentiometer, with variable resistance dials and other meters mounted in vulcanite, in mahogany plinth case -- 24 3/8in.(62cm.)wide; and a Silvertown telegraph needle, in brass case (2)