APPENDIX. 279 



nozzles are shut off for a minute or two longer it is closed, so pressure will 

 not go too high. I use two lines of hose — and sometimes four nozzles on each 

 line. Fig. 272 shows two nozzles ; sometimes it is economy to use one nozzle ; 

 depends on what is being sprayed. 



A dozen nozzles on each hose could be used, and all would do equally good 

 work, but it would bother a man to move around fast enough to use them 

 without wasting mixture. This is a point wherein it is superior to a steam 

 pump. The low cart can be taken with ease under any tree where a horse 

 i-an go. A horse will draw the cart wherever he can draw a cultivator, up 

 hill or down. When the spray mixture is exhausted, the valve between the 

 tanks is closed (saving sixty pounds or so of pressure in the air tank), the 

 refilling valve opened, and in a few seconds all settlings and waste is blown 

 out. By the time the first tank is sprayed out the second is chai-ged ready 

 for use, so no time is lost, only that used in changing horse from one to the 

 other. No ag-itator is used. If the mixture is properly prepared, it will not 

 settle enough to cause any damage, as it does not take long to use up fifty 

 gallons or more of mixture — the time depends entirely upon how many noz- 

 zles are used, and how quickly the man with the hose can move. 



Now as to the cost. For my purpose, all things considered, a gasolene 

 engine seemed to be best. It cost $l(ir>, is two-horse power, weig^hs about 

 two hundred and fifty pounds. The barrel shown in Fig. 271 is half full of 

 water, connected by pipes with water-jacket of engine cylinder. The can 

 up on the frame is the gasolene supply. I heat the hot tube with charcoal : 

 that is the only stuff' I have found that will not blow out on a windy day. 

 The air compressor is a ."JxO No. 6 Clayton-Brackett compressor, cost $()U. 

 Engine runs four hundred revolutions, size of pulley ten inches, belt three 

 inches. With only one hundred and twenty-five pounds maximum pressure 

 and the fact that in changing, the compressor stops, no water-jacket is really 

 necessary, although I use a little water in the jacket. 



The tanks can be had of any manufacturer of soda-water or bottlers" sup- 

 plies. They are known to the trade as "air tanks. " They can be had in any 

 size, are tested to two hundred pounds or more, are not very heavy, and cost, 

 last winter, $15 each for fifty-gallon tanks. Everyone knows what nozzles, 

 hose and connections cost. I used grape-wagon wheels and axle for the 

 carts. The framework costs possibly $5, for each. J used fifty-gallon tanks 

 because I have to use up pretty steep hillsides, and wanted it so one horse 

 would have no trouble. 



