. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. SPRAYS AND OTHER MEANS OF CONTROL 1895. Fig. 10. (5) A pressure regulator of a novel type which effects a great saving in power, prevents unnecessary wear, is positive in ac- tion, and has readily accessible parts. at normal speed. Hand and barrel pumps should have air chambers which hold at least as much as the amount of liquid dispatched by the
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. SPRAYS AND OTHER MEANS OF CONTROL 1895. Fig. 10. (5) A pressure regulator of a novel type which effects a great saving in power, prevents unnecessary wear, is positive in ac- tion, and has readily accessible parts. at normal speed. Hand and barrel pumps should have air chambers which hold at least as much as the amount of liquid dispatched by the plunger per minute, while twice this size is better and is not too large. Traction machines need an air chamber having about twice the ca- pacity of the pump in gallons per minute. The air chamber usually forms part of the pump, but most of the traction spray- ers and a few of the hand and power machines have it separate. The better types of air chambers are made as light as possible consistent with the strength required, and some provision is made for agitation when the chamber is of large capacity. Pressure Gauges The pressure gauge i^ the index which makes possible careful and exact spray- ing when the remainder of the acces- sories are normally good. The operators of hand and barrel pumps are especially liable to overestimate the pressure they obtain while spraying. With hand or barrel sprayers, few operators realize how much the pressure varies, or how much it depends upon the degree of weariness the operator feels toward the end of the day. The work varies in thoroughness, and the spray in quality, whenever the pressure is allowed to run down below the normal working amount. Relief Yalves Power and traction spraying machines must be equipped with a relief valve or pressure regulator in order to avoid ac- cidents. The poppet types of relief valves, ordinarily furnished with power outfits, are not suitable for use on spraying ma- chines where the spraying mixture con- tain
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