SPRAY PUMPS. 



173 



sprayers as now constructed are heavj^ cumbersome affairs, which 

 could never be of practical value in everyday orchard work. Of the 

 machines or descriptions of the same which have come to the writer's 

 attention, none have thus far appeared better adapted to practical and 

 continuous orchard work than one in use at San Diego. This machine 

 was planned and constructed for Mr. H. R. Gunnis, of San Diego, 

 and has seen practical service .for several years. It has ])een more 

 or less changed and perfected from time to time, such improvements 

 being made as have seemed best from experience gained in actual and 

 extensive orchard work. This machine, as iirst called to the attention 

 of the writer by Mr. Gunnis in the early part of July, 1805, is illus- 

 trated in PI. XXIX. The 

 photograph from which this 

 plate was made was taken 

 while the machine was being 

 used in spraying a young 

 orchard near Santa Barbara. 

 In reference to the changes 

 made since this photograph 

 was taken, Mr. Gunnis writes: 



"The chanoes made in the 

 machine since I corresponded 

 with 3^ou regarding it in 1895 

 consist in the addition of a 

 rotary supply pump and the 

 use of a tender cart for haul- 

 ing the material to the machine 

 instead of having to shut down 

 and go to the material every 

 time the tank is emptied." 

 Mr. Gunnis further says, 

 under date of March 10, 

 1899: "The machine is still 

 in constant use, and I can still say, as I wrote you over three years 

 ago, that it has developed no defects whatever. Some of the parts 

 wore out from actual service and have been replaced, but no changes 

 have been made in its construction. * * * The use of the supply 

 pump and tender increases the capacity of the outfit 25 or 30 per cent, 

 especially in large orchards. In very small places it can also be used 

 economically by two men, both spraying, as a good, steady team can 

 soon be taught to move and stop at the word. In this case it is not 

 necessary to use the tender." 



While it is believed that the machine which Mr. Gunnis has built 

 and operated is superior to any other of its class, I am informed that 

 the gentleman contemplates still further improvements. In regard 



Fig. 8.— Spray ptimp for general orchard work, upright 

 lever. 



