Methods for close automatic control of incubating temperatures in laboratories . ts of clean, sharpcoat had thoroughlydried, the secondcoat, approxi-mately one-fourthinch in thicknessand mixed in theproportion of onepart of Portlandcement to one andone-half parts ofclean, sharp sand,was applied a-ndbrought to a floatfinish. Shelves.—Shelveswere originally con-structed (fig. 2) of1-inch galvanized-metal pipe, coveredwith galvanized-wire mesh made ofXo. 16 wire withfour meshes to theinch. The wiremesh was securelysoldered to the pipeframe, care beingtaken to leave noprojections thatmight cut or
Methods for close automatic control of incubating temperatures in laboratories . ts of clean, sharpcoat had thoroughlydried, the secondcoat, approxi-mately one-fourthinch in thicknessand mixed in theproportion of onepart of Portlandcement to one andone-half parts ofclean, sharp sand,was applied a-ndbrought to a floatfinish. Shelves.—Shelveswere originally con-structed (fig. 2) of1-inch galvanized-metal pipe, coveredwith galvanized-wire mesh made ofXo. 16 wire withfour meshes to theinch. The wiremesh was securelysoldered to the pipeframe, care beingtaken to leave noprojections thatmight cut or scratchthose worldng int h e was found, how-ever, that the wire-mesh covering of-fered more or lessresistance to plac-ing the trays onthe shelves, and itwas subsequentlyremoved and thetrays containingthe flasks are nowplaced directly onthe pipes. All thetrays containing the CONTROL OF INCUBATING TEMPERATURES IN LABORATORIES 5 flasks are of the same size and fit on the pipe frame. Where different-sized crates are used, however, the wire covering- is ^ & -iil&i^m m a ci 10 r HEATING EQUIPMENT. Electricity is used in all cases as the heating medium. Two systemsof temj^erature control, however, are used. The temperature-control 6 BULLETIN 951, U. S. DEPAETMENT OF AGEICULTUEE. apparatus for the first incubating compartment was designed andfor the most part constructed in the bureau. The temperature-con-
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1921
