Browse Items (3473 total)

Sheet of frosted glass fitted into a wooden base.

Wide-bodied oil diffusion pump with supplementary diffusion pump at outlet.

Farnell BINARY modules in ABDNP:201911a

Farnell DELAY module in ABDNP:201911a

Farnell NOR modules in ABDNP:201911a

Farnell OR module in ABDNP:201911a

Dip quadrant. A long steel needle mounted on a brass stand allowing it to rotate in one direction. An arc of brass projects from the base of the stand in the same direction as the rotation of the needle. The arc is marked with a degrees scale.
For determining the angle of tilt from the vertical of the local magnetic field. Brass dip quadrant calibrated at 2 degree intervals from 0 (at bottom) to 84 degrees on circular brass base with embeeded lead weight. Pivoted lozenge-shaped needle…

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Black cardboard box with a direct drive dial inside wrapped in polythene and tissue paper. Direct drive dial is a large grey metal disc with a scale round the outside from 0 to 190 and a black plastic knob on top. Included in the box is a dispatch…

Hand sized brass spectroscope with small button to shut aperture. For looking through to see spectrum of sky, mainly to judge water absorption levels

Hand held brass spectroscope with variable aperture and variable focus. Can see the prism inside it. Engraving on barrel.
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