Browse Items (3400 total)

With separate closing end. 5 coils per leg. Brass terminals. Combination typical of early to mid 19th century coils.

cylindrical box with "Atwood's Replace Riders" written on top. Inside contains 15 metal slides of varying size with a hole punched in each of them.

Leslie's differential thermometer. Double bulbs on ends of a tube set into delicate wooden base. One bulb blue, one clear; liquid (blue) broken column. Faded mark on underside base showing existence of rectangular label.

On wooden base. Brass terminals, iron core.

Wooden beam with two sliding lenses on it, assumed for use with part a of set. Set up as a telescope arrangement.

Dark-coloured wooden handle with hollow yellow glass stem, brass end. Small threaded screw at end of brass to take attachment.

Finely made divided windpipe - square section at base. Hopkins' fork is used with Chladni's plate to test whether pairs of vibrating zones are in-phase or out-of-phase.

Cylindrical glass hand hold approx. 35 mm long x 20 mm diameter attached to top of glass. Containing clear liquid and working.

2 brass plates with cogs in between. They are all connected and move together but one end moves more freely that the other. On the looser end, there is a metal device that moves a hand outside the plates. On the stiff end there is a cord connected…

Oil lamp with glass lens; black painted brass with small carrying handle on base.