1898 



ENCYCLOPEDIA OF PRACTICAL HORTICULTURE 



Fie 16 (11) A secUoual view „£ a leakless 

 fod cutotr showinR the comparatively large, 

 straij-'ht passage-ways. 



per minute, depending upon the size of 

 the jet pump and how high the water 

 must be lifted. 



Piping and Ciit-Offs 

 The piping used to carry the spray 

 liquid from the air chamber to some 

 convenient point for attochment of the 

 leads of high-pressure hose should be at 

 least one-halt inch in diameter and make 

 as few turns as possible The pressure 

 of the spray liquid at the nozzle is great- 

 ly reduced by friction of the solution 

 against the walls of tho pipe if the 

 changes of direction are frequent, and if 

 the size of the orifices through which it 

 passes are small. The cut-off, at the 

 point of attachment of the hose lead, per- 

 mits the shutting off of one lead of hose 

 whenever desired, and this takes unnec- 

 essary strain off the hose which is not 

 in use. The three-way cut-offs, ordin- 

 arily furnished with machines, are al- 

 ways being turned in the wrong direction, 

 with the result that some one is fre- 

 quently drenched with spray liquid. Plain 

 cut-offs are superior to the globe valves. 

 See Fig. 14 (9). The latter usually change 

 the direction of flow very abruptly, and 

 soon become leaky, besides requiring a 

 lot of time to shut off the hose lead. Gate 

 valves are apt to become partially clogged 

 with sediment, which prevents their clos- 



ing properly, lJ»t they are superior to 

 the globe valves, because they are of 

 large capacity and do not change the di- 

 rection of the flow of the liquid. The 

 simple, leakless cut-off. shown in Fig. 15, 

 is positive in action, easily operated, does 

 not change the direction of the flow of 

 the liquid, is readily adjusted or reiiacked, 

 and is of large capacity. A sectional view 

 of the leakless rod cut-off is shown in 

 Fig. Ifi, giving an idea of the simplicity 

 of its construction. .Tust under the cap- 

 nut is a packing gland which allows any 

 slack in the valve to be taken up, and 

 also prevents any leakage. 

 Hose. Hose ronnections and Hose Bauds 

 The high pressures tised in spraying 

 with modern power spraying machines 

 make the use of strong, heavy-walled hose 

 imperative. Half-inch high-pressure hose 

 of five, six, or seven-ply construction is 

 generally used for this purpose. The 

 heavier grades usually last enough long- 

 er, except -where oil sprays are used, to 

 warrant their purchase. Three-quarter- 

 inch hose, having sufficient strength to 



I'-lK 



17 (12 and 13) Slngle-lcnctli hose con- 

 t nna with round mit. The kind every 

 or, t ™l ^p.av I c ontflt should not have 

 'i Vm in l...uhh. length one-tourth nch 

 ; ,t- im-ad mah. and sL^nda.-d fonnUe hose 

 •onnections, per.nllling the "«' ,, ' ^^ ' ''^^^ 

 i.nndM of the Sherman type. J hese nave a 

 hexago al lange and hexagonal nut so hey 

 ean he adjusted with an ordinary wreneh. 



