88 



INJURIOUS INSFXTS OF 1904. 



cart by the side of the "Simplex." This pump is so connected with a 

 tank which can be filled with kerosene that every stroke of the han- 

 dle not only draws water from the water reservoir through one pipe, 

 but also, at the same time, a regulated amount of kerosene from the 

 kerosene tank, the oil and water mixing mechanically, and issuing 

 from the nozzles as a fine spray, the so-called Kero-water mixture. 

 This is very effective, easy to prepare, in fact it calls for no prepara- 

 tion, as the kerosene emulsion does, and easy to apply. Unfortunate- 

 Iv, the writer has vet to see one of these Kero-water machines which 



Fig. 86. — Hand Dust Sprayt-r at work. 



pumps true to the indicator. Our experience has been that if the 

 indicator points at 10 per cent one is not at all sure of obtaining 

 that percentage of oil in the water, in fact, he is quite sure not to. 

 When the indicator of our "Peerless" pump "indicated" 20 per cent, 

 we found by actual test that we were pumping 10 per cent, 25 per 

 cent register giving 15 per cent. With the indicator at 30 per 

 cent we obtained 25 per cent, while 50 per cent on the indicator gave 

 nearly 50 per cent by actual test as it came from the nozzles. The 

 indicator's 10 per cent and 15 per cent gave such a small per cent 

 of oil, far below the figure indicated, as to be practically worthless 

 for our purpose. We found further that when the oil in the oil tank 

 got quite low, the per cent materially changed ; for instance, with the 

 indicator at 25 per cent we pumped 15 per cent steadily until tank was 

 nearly empty, when test showed that we were getting only 5 per cent. 

 This inaccuracy and variation is common to all the Kero-water pumps 



