We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
March, 1930] WATER COOUNG OF INCANDESCENT LAMPS 337
AN EXPERIMENTAL WATER COOLED UNIT
The unit at present in the process of development consists of a lamp immersed directly in the absorbing liquid which is confined by an outer glass jacket. A cooling coil through which tap water is circulated is also immersed in the absorbing liquid. Convection currents set up within the liquid are sufficient to maintain a circulation, and no mechanical stirring is necessary. The lamp, cooling coil, and outer jacket are all supported from a base plate on which the lamp socket is mounted. Two gaskets, one between the base plate and the jacket, and the other between the base plate and the lamp at a point just
TABLE II Results of Experiments on the Absorption of Heat
Light Source
Absorbing Cell
Light Transmitted
Radiant Energy Transmitted
Radiant Energy for Constant Light
400 w. or 150 w.
lamp
None
100%
100%
100%
400 w. proj . lamp
1 cm. H2O; parallel plates
89%
23%
26%
150 watt lamp
1.7 cm. H2O; cylindrical
87%
29%
33%
150 watt lamp
Va% CuCl2; cylindrical
85%
10%
12%
150 watt lamp
1% CuCl2; cylindrical
78%
6%
8%
below the base, make the unit water tight. Fig. 4 is a photograph of a unit for a 1500 watt lamp. The base plate is five inches in diameter, the outer jacket four inches in diameter, and the over-all length fifteen inches. Nine turns of 0.25 inch copper tubing serve as the cooling coil.
This type of arrangement has several advantages. The absorbing layer of water practically surrounds the light source so that almost no radiation reaches the atmosphere of the room except through the absorbing medium. Cooling water is circulated in and confined by the coil so that either distilled water or some heat absorbing solution may be kept permanently in the jacket. The jacket and lamp surfaces are thus kept clean and free from the deposits of ordinary tap water, although tap water is the cooling agent. Another advantage is the possible use of smaller bulb sizes. The temperature of the bulb is not a limiting factor in this case.
In one experiment, a 1500 watt, 115 volt filament was mounted in a special 2.5 inch tubular bulb, and this lamp placed in a unit as shown in the photograph. Measurements were made of watts input into