Magnifying glass in wooden frame on brass stand with "W. Ladd, London, Univ. Abdn. Nat. Phil." engraved on base. Can be adjusted in height but is very stiff.
Brass stand on circular brass base with adjustable arm at top holding a brass mounted 6 layered 60 degree prism. The arm can only be adjusted in the angle of the prism, not the height.
Motor driven metal wheel with 30 rectangular slits attached to a smaller reduced speed cog and bell on a solid cast iron base. Small plate with "W. G. PYE & Co. Cambridge, London".