Browse Items (3472 total)

A pre-1832-Reform Act look at corruption in parliamentary elections.

This poster urges the electorate to vote for the Tory Provost James Hadden.

a substantial soft iron core wound with 10 coils (5 on each leg) wired in series aiding and joined to a copper bus and two brass thumbnuts. A horseshoe 'keeper' is separate

Curved end piece for electromagnet 200499a

A medium sized electronic valve with stout cylindrical glass casing, metal base and 4 pins. Part of a massive collection of valves in a cardboard box.

A large electronic valve with glass casing, plastic base and 4 pins. Part of a massive collection of valves in a cardboard box.

box, wooden frame with glass front and back. Brass rod connects a gold leaf to a top touch disc. Copper leaf against one side connected to an external thumb nut contact. Silver foil lining.

1 electrically tapped coherer on stand. Coherer is reset by electrically operated tapper. Glass tube replaced after breakage, c. 1990.

Brass cylinder with rounded ends on glass stand on wooden base; small round wooden feet; one hole at top of each end of cylinder; with engraving

two brass discs the upper suspended by a movable rod above the lower, possible to move electrical charge to demonstrate capacitance. The upper disc is held by an insulated pillar and curved brass rod