Browse Items (3473 total)

A glass valve or cathode with model printed on the sticker. It is cylindrical with 8 pins from it's base and a large metal cylinder around the top. Part of a massive collection of valves in a cardboard box.

Brass cylinder with a cog and a disc connected to the bottom, the cog being above the disc. The lid of the cylinder comes off to reveal a clockwork handle, a screw type handle and a switch that can be moved progressively from F to S.

plastic box with a glass lid containing 6 big shiny rocks and some shards + scrapings.

Early electrical carbon arc lamp. Missing glass chamber, only fragment remains

Equipment for the Rayleigh scattering experiment. Small light bulb, diffuser (frosted glass), 2 lenses, cubical glass container (for liquids?) and a white screen housed in a wooden frame. On base there is a plastic plate object name on it. Complete…

glass dome with wide brass neck piece and hole, possible for suspending an apparatus inside or attaching a tube

Metal casing with large light bulb inside and circular window with movable metal cover. Power cable still attached.

tin cylindrical float terminating in a cone hat has a ring for attaching additional weight. A rod protrudes from the top, terminating in a circular tray. Possibly an early hydrometer

Brass disc with wooden disc screwed to one side with wooden rod attached; pieces of copper leaf attached to end of rod

Piece of thick fibre optical cable with sheath and casing (not visible to naked eye). Light enters one end and exits out the other having been reflected within the cable