Browse Items (3473 total)

heavy brass seconds pendulum (lead filled? not examined), with twin spring suspension.

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.

a glass centigrade thermometer, scale -10 to 100 deg C. Black ink liquid. In cardboard tube

Sending key on mahogany base with small receiver switch and other integral wiring. Additional connection and capacitor in base put there when setting up telegraphic circuit in 1980s.

4 terminal standard resistance in blue-grey metal box with brown insulating top.

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.

Coil 500 turns; attached paper label of more recent origin '. L 155 mH R 73.07 Ohms ' Wooden frame with brass handle and slots for engorging vertically or horizontally.

Small collection of original off-prints mentioned in "The Atlas computer in the 1960s and early 1970s: a personal reminiscence".

a mercury glass centigrade thermometer, scale -5 to 105 deg C. In cardboard tube