Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . Fig. 139. Yarn Spun With and Without Humidifier. 275 262 WEAVING The instrument for measuring the degree of relative humidityis in the form of a double thermometer, technically called hygrome-ter; to one there is connected a Avet bulb; a wick attached tothis and resting m a small quantity of water is so influenced bythe atmosphere as to register on the hygrometer the degree ofhumidity. As the air becomes dry the moisture surround
Weaving; a practical guide to the mechanical construction, operation, and care of weaving machinery, and all details of the mechanical processes involved in weaving . Fig. 139. Yarn Spun With and Without Humidifier. 275 262 WEAVING The instrument for measuring the degree of relative humidityis in the form of a double thermometer, technically called hygrome-ter; to one there is connected a Avet bulb; a wick attached tothis and resting m a small quantity of water is so influenced bythe atmosphere as to register on the hygrometer the degree ofhumidity. As the air becomes dry the moisture surrounding thewick is absorbed, thus loweruig the indicated temperature in thatthermometer, mcidentally indicating the difference m the humidityof the room. If there was no evaporation from the wet bulb, itwould indicate that the air in the room was thoroughly saturatedand both thermometers would read the same. g76. < Q <! Of PI o o<! en ?J eS w W & a o S •- EhK m QK o pq JACQUARD MACHINES The term Jacqiiard Weaving may be applied to all harnessweaving that is above the range of harness shafts, so that a jac-quard machine is simply a shedding motion whereby a largevariety of sheds may be formed. The greater the number of lift-ing hooks contained in a machine, the greater will be the range ofpatterns that may be woven. Jacquard machines range from 100to 2600 hooks. Since its introduction the jacquard machine has undergonemany changes in regard to the methods of operating the differentparts of the machine, but the principles remain the same, Jacquard machines may be classed under four heads, as fol-lows: First, Single Action Machines, meaning single cylindermachines; second, Double-Lift Single Cylinder Machines; third,Double Action Machines, meaning double-lift and two cylinders;axidi fourth. Rise and Fall Machines, which have a close-shed mo-tion. There are also special machines.
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