A scale expansion unit for the Grubb Parson Spectrophotometer. 3 dials, 2 ranging from 1 to 10 and the other from 1 to 5 in single divisions. 2 cables. In cardboard box with an assortment of screws, washers and cogs. On unit in white lettering "Grubb…
Glass tube with brass ends; with ball terminals; inside tube is spiral of small metal discs each seperated by gap of less than 1 mm; when tube is placed across an electrostatic generator, a spiral discharge is seen around inside of tube caused by…
two nickel (?) balls mounted on insulating rods affixed to a wooden base. Connection is made to the balls by plug in brass connectors, the connecting wires have been cut off. Mounted on a rectangular wooden base with four rubber feet, one ball can…
piece of metal on the end of a metal rod. The metal rod has a brass ball on the other end. The device is placed on metal block and heated at one end. When left to cool it moves slightly emitting a rocking sound.
one of a pair, circular base weighted with lead, the vertical tapers upward from a bulbous bottom, terminating with a wing nut for holding a telescopic inner section of glass rod
Motor driven metal wheel with 30 rectangular slits attached to a smaller reduced speed cog and bell on a solid cast iron base. Small plate with "W. G. PYE & Co. Cambridge, London".
