Browse Items (3473 total)

Selenium rectifier with black cooling fins. Every fourth sheet has a hole in one corner while all other corners have been taken off. The central rod has screw terminals at either end.

Glass density bottle; etched onto bottle '25 Grammes, 60 F'; in custom-made black-painted tin; packed in cotton wool

One of two tubes have a spiral glass feature; presumed to have been acquired as a set with five others

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

4 anamorphic drawings on circular sheets of waxy paper. Small hole in centre of sheets:
1) Bird of paradise in blue, red and green.
2) stork in black and white with red beak and legs and green frog in its mouth
3) diagram of four overlapping…

mixture of items from 3 light bulbs to a block of wood

Used with BBC computer. no makers name; with phone connection wire

mounted on a wooden base. Originally drove two diameters of belt, but amateurishly modified by the addition of a rough propeller.

Demonstration of dependence of rate of flow eith head of liquid. A cylindrical metal vessel standing upright on three feet. There are three equally spaced taps mounted one above another. A tube attachment inlet is fitted at the base and a glass…

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