. A manual of dyeing: for the use of practical dyers, manufacturers, students, and all interested in the art of dyeing . ept briskly boiling inthe copper bath. A slightly higher temperature in the dye-vessels may beattained by adding common salt, or some other salt—, calcium chloride—to the water in the copper bath; but for all ordinary purposes where glassbeakers are used no addition is required. Fletchers tube-burner. No. B 24, isrecommended for boiling the water in the copper bath. Sometimes earthenware pots are used in place of glass beakers, but onaccount of the thickness of the vesse
. A manual of dyeing: for the use of practical dyers, manufacturers, students, and all interested in the art of dyeing . ept briskly boiling inthe copper bath. A slightly higher temperature in the dye-vessels may beattained by adding common salt, or some other salt—, calcium chloride—to the water in the copper bath; but for all ordinary purposes where glassbeakers are used no addition is required. Fletchers tube-burner. No. B 24, isrecommended for boiling the water in the copper bath. Sometimes earthenware pots are used in place of glass beakers, but onaccount of the thickness of the vessels it becomes necessary to use either strongsaline solutions, oil or glycerin in the copper bath. The water in the dye-pots,however, does not usually get heated regularly, and in order to overcome thisdifficulty, as well as to reduce the risk of fire attendant on the use of anordinary oil bath, R. L. Whiteley* has devised an improved bath, which isshown in Fig. 119. It is made in two parts. The lower portion {a), made of copper welded andbrazed together, measures 21| in. x 15J in. x 6 in. and has an internally-. Fig. 119.—Whiteleys oil bath for dye-testing. projecting rim, h, so that in case the temperature should rise to the boilingpoint of the oil, it will be thrown towards the centre. The upper portion ofthe bath, c, fits into the lower by means of the rim, c?, which projects down-wards about f in. In this portion, which is tray-shaped, six copper cups (.5 and b^ ins. wide) are fixed to receive the dye-pots. The space between thedye-pot and the cup is filled with glycerin. The tray is provided with anaperture for a thermometer, and at each end projects a handle by means ofwhich the flaps, e, can be moved and the oil stii-red so as to equalise thetemperature. Cotton-seed oil is recommended to be used for the copper bath,which is heated to a temperature of 160° to 170° C. by means of a setof three Wrights No. 310 burners. In making experimental dye-tests the a
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdyesanddyeing, bookye
