Laboratories, their planning and fittings . Fig. 90.—Settling Pots at Leipzig. use of lead has been given on page 336 or 7 lbs. to the sq. ft. should be employed. Settling Pots.—Opinions difi^er as to the use of settling pots or gulleytraps in laboratory drainage for the purpose of catching material which shouldnot find its way into the drains external to the building. Where there areno drains in the fittings, and all sinks contain grids which cannot be readilyremoved by the students, they are hardly necessary, except for the purposeof recovering mercury, for which provision may be made at the
Laboratories, their planning and fittings . Fig. 90.—Settling Pots at Leipzig. use of lead has been given on page 336 or 7 lbs. to the sq. ft. should be employed. Settling Pots.—Opinions difi^er as to the use of settling pots or gulleytraps in laboratory drainage for the purpose of catching material which shouldnot find its way into the drains external to the building. Where there areno drains in the fittings, and all sinks contain grids which cannot be readilyremoved by the students, they are hardly necessary, except for the purposeof recovering mercury, for which provision may be made at the main channelexit or exits from the laboratory, but where a sudden drop is necessary, as ^ Burnt joints, made by fusing the edges of the lead itself together, should be used. LABORATORY SKRVICKS 149. ?U i.^.^^... often occurs at the ciul of bench drainage, some enlargement for the cascadeis required and a settled potmeets the ilifficulty. Usuallyof earthenware, 10 ins. to 12ins. square inside and the samedepth, but sometimes cylindrical,these pots have spouts well be-low the top, the sectional area ofwhich should exceed the sum ofthe areas of the sink wastes orgrids, if provided, behind it, toallow for their slight dischargehead. The discharging spout issometimes carried down as partof the earthenware inside thepot to prevent floating bodiespassing on to the drains, butunless the diameter is reallymaintained in this pipe, prob-ably some form of vertical gridis less likely to give trouble, andthis should be placed portcullis-like across the pot. Very smalllead tube reinforced by ironwire fthreaded through it, andthen closed at each end, wovento a coarse mesh, might provea simple and effective grid. Very elaborate forms ofpots are used in some institu-tions. Fig. 90 shows the ar
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
