Browse Items (3473 total)

brass pole with two poles with balls on the end that can move out from the main pole

arch shaped stand with a copper disc and a bar magnet suspended from the top

Specimens for observing strain-induced anistropy in polarised llight. 3 wooden frames each inset with a anisotropic glass specimen of different shape; flower, circular, octagonal shapes.

6 wooden wave cut outs.

Wooden U frame with iron rod, 2 different sized (approx. 28 mm and 22 mm diameter) brass balls sliding on rod linked with string; (hardened) rubber end pads to cushion balls. Central post to fit Watkins & Hill 's whirling table. Embedded disc '…

Watt governor model in brass to fit Watkins & Hill 's whirling table. Brass balls on rods, total 200 mm long.

Sending keys on mahogany base with small receiver switch and other integral wiring.

Siemens Relay. No 22 on mahogany base.

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.

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.