Laboratories, their planning and fittings . sses provided with movable casings infront. A scheme of distinctive colours for the painting of pipes is a greatassistance in tracing them, which must frequently be the duty of those notconversant with their arrangement, and, where flow and return differ, as in LABORATORY SERVICFCS 121 the case of electricity ami hot water, a further distinction in appearanceshould be inaile. The movable heads of different fittings should be of dis-tinctive patterns to avoid mistakes, and this distinction should, if possible,enable fittings to be confidently operated
Laboratories, their planning and fittings . sses provided with movable casings infront. A scheme of distinctive colours for the painting of pipes is a greatassistance in tracing them, which must frequently be the duty of those notconversant with their arrangement, and, where flow and return differ, as in LABORATORY SERVICFCS 121 the case of electricity ami hot water, a further distinction in appearanceshould be inaile. The movable heads of different fittings should be of dis-tinctive patterns to avoid mistakes, and this distinction should, if possible,enable fittings to be confidently operated in the dark in emergency. GAS. Alternatives to Coal Gas. Although the use of ordinary coal gas isalmost universal, a few words may be said on the provision which can bemade in such exceptional circumstances as preclude its employment. Settingaside the production of water gas, oil gas, and the like, which require plantand attendance in some degree commensurate with coal gas on a small scale, vrriK FLOon Pipes UKAATcmy CODRiBOR lASCIIATOitr. Fig. 75.—Section Showing PipeDuct over Corridor. Fig. 76.—Main Cut-ofFs for Services, Leipzig. acetylene and petrol gas are the simplest substitutes. The writers personalexperiences of acetylene date back to what was probably the first installationfor heating by acetylene in this country, which is still in operation after morethan twenty years.^ Acetylene requires special Bunsen burners which work under a pressureof 4 or 5 ins. of water. The service pipes may be about half the sectionalarea of those required for coal gas, and an ordinary bench burner consumingabout I c. ft. an hour gives a flame of about twice the effectiveness of acoal gas Bunsen consuming the usual 4 to 5 c. ft. The temperature of thisflame has advantages and disadvantages ; it enables heating operations to berapidly performed, and the blowpipe to be frequently dispensed with, and italso involves greater care to avoid breakage of glass through sudden heating. ^ A small
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
