336 The Principles of Fruit-growing 



Pump — 



General construction: as above. 

 Valves: composition and design. 

 Cylinder lining. 

 Provision for drainage. 

 Provision for supplying air to air-dome. 

 Reliability of pressure gauge. 

 Type of pressure regulator. 

 Outfits 



Tank: Wood or metal; location; design suited to agitator. 

 Trucks: Steel or wood; rigidity; strength; weight. 

 Wheels: Diameter; width of tires; metal or wood. 

 Tower: 



Weight; detachability; position. 

 With raiUng or straddle. 

 Hose — 



Quality; diameter; length; number of ply. 

 End couplings set in rubber and boiind in place, without 

 sharp projections to catch in operator's hands. 

 Extension rods — 



Length; Bamboo or not; aluminum, brass or iron. 

 Character of end ferrules (whether they slip through the 

 hand easily, and thoroughly grip the core). 

 Nozzles — 



Kind; quality. 

 Cut-offs- 

 Globe or ball or quarter-turn. 

 Anti-leak; rapidity of action. 

 S. Cost. 



Accessories suppUed: e. g., fillin g pump and suction hose; 



magneto; hose; rods; nozzles; tools; crooks; tower. 

 Ratio of cost to capacity and efficiency. 



INSECTICIDES AND FUNGICIDES 

 (Adapted from Crosby and Matheson, and from Reddick.) 



Of poisoning insecticides, the most widely used and 

 effective substance is arsenic in its various forms. Arsenic 

 is never used pure, but only when chemically combined 



