„ 429 CONVECTION IN LIQUIDS (742) 1888
.-*■
Glass tube formed into a rectangle, with tubulure. Sides of rectangle
230 and 235- This is part of an apparatus intended to show convection
of heat in water. The rectangle is held vertically at one side in a metal
clamp that is heated, causing a circulation of the liquid. The motion is
revealed by powdered amber in the water. Frick (1905), pt 2, 1564, fig.
3835.
430 CONDUCTION IN GASES If43) 1888
429
Glass tube (length 365) with two tubulures, fitted with corks. The corks
have electrical terminals connecting to platinum wire. Apparatus to
demonstrate conduction differences between hydrogen and air.
431 ABSORPTION OF HEAT BY GASES (761) 1886
Signed: E. DUCRETET & Cic A PARIS
Base diameter 83; tube length 271, diameter 35
Brass tube, with glass ends (separation 260) and inlet/outlet taps, on a
telescoping pillar, mounted on a leaded brass circular base. The base
and taps are stamped in oval with the makers name. The design of this
apparatqs is after John Tyndall (1820-1893), for measuring the diathermy
of gases and vapours. These are circulated through the tube, which is
placed between a thermopile and a source of heat, such as a copper plate
heated by a burner, or a tank filled with boiling water. Purchased for
Dfl. 100.00.
An associated piece of apparatus is a mahogany frame (480 x
107 x 260) holding 4 glass U-tubes connected by glass and rubber tubing.
This could be used for drying a gas when a suitable material was
placed in the tubes. Müller (1868), 833-839, § 266; Encyclopaedia
Britannica, XIII, 153; Brenni (VIII).
432 GLASS ATTACHMENTS (794,795) c. 1890
Assortment of glass apparatus, comprising:
794 Tulip glass with side and base tubulure, holder for thermometer.
795/1 Glass bulb, two side tubes, mercury thermometer (length 155),
held by rubber. Thermometer scale: -20° to 150°.
11-1 Glass reservoirs with side tubes.
Two thermometers, one in rubber bung.
This apparatus is said to be for experiments on the salinity of water,
under various heats and pressures.
432