Browse Items (3473 total)

13 masks in individual envelopes in a clear plastic box. Masks are square pieces of glass painted black with either a pin hole window or a circular band.

Mercury Vapour lamp for the Hilger Spekker Absorptiometer, H760301.

Power cable for Hilger Spekker absorptiometer, H760301, 3 Amp plug and adapter.

glass hydrometer, scale1400-1600, lead weighted bottom bulb. In red cardboard box

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

Brass mounted pair of lenses fixed to a wooden block. Possibly a piece of a telescope. With leather lens cap.

a glass sealed tube with three liquids of different viscosity's. In a red leather covered wood cylinder

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 '…

cylinder with screw hole on top of wooden base with groove for running along optical bench.

Metal Morse code taper with plastic base and finger knob. Engraving moulded into underside, possibly ex forces?