77 



method hy which this pump can be connected with the engine. It is 

 unnecessary to disconnect the spra^'ing- pump from tlie engine, as the 

 suction hose of the spra}' pump may be removed from the spraying- 

 tank. This filling pump and connections can be purchased for about 

 $20, and the time and labor saved b}^ its use will pay for it many 

 times over during" the season. This idea of having a filling pump 

 attached to the spraying machine was originated and carried out suc- 

 cessfully by Hon. Edgar Wilson, of Boise, Idaho. 



As before stated in regard to hand-power outfits, it is found much 

 more expedient to use onl}' two lines of hose. The length of this hose 

 will depend upon the method used in spra3dng the trees. Bamljoo 

 extensions and nozzles are the same as those used in power outfits. 

 It is found that water from irrigating ditches contains a considerable 

 amount of sand. The efi'ect of the sand and the lime in the spraying 

 solution is to cause the face of the nozzle to become badl}^ worn, ren- 

 dering- it unfit for use in five or six days of continuous spraying. 

 Letters have l)een written to the more important manufacturers call- 

 ing- their attention to the fact that if these faces were hardened or 

 made of steel the nozzles would last much long-er, and it may be that 

 these firms will shortl}' put such improved nozzles on the market. 



The tanks used in these spraying outfits may be made of wood or 

 galvanized iron. The latter would be preferable on account of its 

 lightness, l)ut it would })e disadvantageous because it would be some- 

 what diflicult to thoroughly brace it. The tanks should not have a 

 larger capacity than 150 gallons and should be placed on the front end 

 of the frame. Screens should be placed over the end of the hose lead- 

 ing from the filling pump, as well as over the suction hose from the 

 spraj^ing pump. 



The agitator which has given the best satisfaction in this connection 

 is formed by two paddles set at an angle, mounted on a vertical shaft, 

 and run by power derived from the gasoline engine by means of a belt 

 and bevel gearing. This agitator keeps the spraying solution in violent 

 agitation and renders it uniform. 



The whole machine, engine, pumps, and tank should be mounted 

 upon a rigid frame. On this frame there should be a platform at 

 either side, with a railing, upon which the operators can stand. There 

 should be supports for the bamboo extensions placed near the center 

 of the outfit. (PI. XI, fig. 2.) This frame can be mounted upon an 

 ordinary wagon, but it is preferable to use a low wagon with steel 

 wheels and tires not less than 6 inches in width, which will largely pre- 

 vent the wheels from sinking into the soft earth. A team and two 

 men are required to operate this outfit. Both of the men spray; one 

 drives^ and the other starts and stops the engine. This reduction of 

 labor makes a material reduction in the cost of spraj^ing. 



Many tests have been made of these machines working under actual 



