Bertrand's stauroscopic eye piece for use with 1893-26/1. Some other pieces are:- Two small prisms, small support with gimbal mounting, tools, nicol in mount Bertrand's stauroscopic eye piece for use with 1893-26/1
Nine prisms in wooden box, including a composite one made out of six different glasses, 5 by Chance of Birmingham, with MS list of the glasses, late 19th century (Wellcome B885) Nine prisms in wooden box 1880-1900
