Browse Items (3473 total)

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…

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

Wooden tube. Alt-azimuth mounting on tripod stand.

Red painted wooden cylinder, part of whriling body demonstration using whirling stand (that we don't have). Small metal hook at top with attached string

Brass with steel points.

Example showing computer hardware technology of 1980s.

glass insulator with wooden handle with brass tapped ferrule; possibly for handling electrically charged objects

Pair of zamboni piles stored in sealed glass tubes with corks; completely sealed units

Varnished wooden box with 8 knobs and 3 brass terminals, "P.S.B.T. Units" on side, No.2802. "Right at 15.5C". Central zero, plugs giving 1,10,100, 1000 ohms each side. Plug insulated handles showing white spots.

central rod with six brass springs attached in a sphere like shape