Browse Items (3473 total)

Wooden tube. Alt-azimuth mounting on tripod stand.

outer tube terminates in a large cylindrical bulb and U bend, the upper part has an outlet junction. The inner tube is held in place by a cork. With ABDNP200372a these items are in a cardboard box marked Thermostats

straight walled glass vessel, silvered half way up the glass and wound with five turns of wire as an electrical contact. A brass rod terminated in solid copper wire filaments is suspended from a three armed cap. Silver filings and debris are in the…

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

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

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 '…

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

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

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

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