Bacteriological survey of "surface" water supplies.

Date:
[between 1890 and 1899]
Catalogue details

Licence: Public Domain Mark

Credit: Bacteriological survey of "surface" water supplies. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    Fig. i. VACUUM OR SUCTION TUBES FOR COLLECTING WATER FROM STREAMS, RESERVOIRS, &C. A. Simple form to be used when the water can be reached by hand. I. Body of tube holding about 20 centimetres, 2. Pair of strong forceps. 3. Level of the water. 4. Place where the tube is cut open for taking water out with the measuring pipette C. B. Tube with bent neck for taking water at a distance of several feet from the banks of a reservoir or stream. 1. Suction tube. 2. T-*baped metallic shea I h holding firmh -together and at right angles the tube and the end of a stick (3). 4. Sterilised thread used for pulling point (5) of the tube, so as to break its neck at the constricted part (6). >j. Level of the water. R. Plare where tube is opened to take water out with measuring pipette C. C. Measuring pipette used for taking water out of suction tubes. 1. Mouthpiece. 2. Body, holding aboul 3 centimetres. 3, Place where the bent point is broken across. When used for counting, this pipette is held horizontally, the bent point being turned downwards ; the pressure under which the water flows is thus kept constant.