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TEACHING LABORATORY INSTITUTE OF BIOCHEMISTRY
UNIVERSITY OF COPENHAGEN
A - SINKS
CW - COLD WATER
D - DISTILLED WATER
H - HOT WATER
CH — CENTRAL HEATING
L - LIGHT
S - FUME CUPBOARDS
Fig. 6
by Krogh1 to a pressure of 100 cm of water above the atmospheric and delivered through pipes to almost all the rooms in the laboratories. There are two machines, one supplying the laboratories of the Science School and another for the two medical institutes. In case of breakdown either of these can supply the whole building.
There is no general vacuum installation. We prefer to rely on local vacuum production and with the high water pressure (3-4 atm.) available, generally employ filter pumps.
The general equipment of the laboratory rooms is shown in Figure 7. It is arranged on the principle of easy adaptability to any laboratory purpose and only a comparatively few rooms have been designed and equipped for a definite and limited kind of work. Cold water, gas, and compressed air are carried in horizontal pipes along the walls at a height of 0.93-1.05 m above the floor. The water-taps are turned upwards and provided with interchangeable fittings. The vertical tube of a secondary waste-pipe is just below each water-tap and can be connected with a movable sink. The compressed air pipes, and in several rooms also
1 Eine einfache automatische Druckluftinstallation und einige Anwendungen der Druckluft. Zeitschr. f. biol. Techn. 3, 1913.
the gas pipes, allow the insertion of extra taps which can be screwed directly into the wall of the pipe wherever required. The arrangement of the pipes is not entirely satisfactory. When the air is damp, moisture will condense on the cold water pipes and may drip on to the tables. The water pipes should therefore have been at a lower level below the bench tops with vertical side tubes connecting with the taps. The pipes for compressed air should have been the uppermost and the gas pipes just above the benches.
The rooms are lighted by Zeiss bell-shaped lamps (Fig. 7) which have been selected after an exhaustive trial. Generally there is one lamp for each unit placed in front of the window at a height of 3.60 m and 55 cm from the wall so as to give a maximum light on the bench which is normally placed here. Smaller lamps are placed over fume cupboards and over sinks placed at the back of the rooms. In each unit one electric point for light and one for power is generally placed near the window, while one or two more are distributed elsewhere in the room. The power points are provided with interchangeable plug fuses which can also be changed for carbon filament lamps acting as resistances.
Figure 7 shows also our “universal pendant” carrying down from the ceiling to 2.0 m above the floor in the