256 



DEVELOPMENTS IN OIL BURNING. 



burned under natural draft, on being heated to 270° at a pressure of 165 

 pounds. A slight amount of smoke was formed which disappeared on a 

 slight increase in the furnace draft above twelve-hundredths inches of water. 

 The most noteworthy feature of the experiment was that the capacity fell 

 off about 40 per cent from that obtained with the same apparatus with oil 

 of 18 gravity. 



This sample of oil was the worst the writer has ever seen, but they say 

 there is more of it and it is a specimen of what we may have to handle in the 

 near future. 



Density op Oil. 



Degrees Baume. 



12 



■4 

 16 

 18 

 20 

 22 



Specific 

 gravity. 



.986 



•973 

 .960 

 .948 

 .936 

 .924 



Pounds per 

 gallon. 



22 

 1 1 

 00 

 90 

 80 

 70 



Degrees Baume. 



24 

 26 

 28 

 30 

 32 



Specific 

 gravity. 



.913 

 .901 

 .890 

 .880 

 .869 



Pounds per 

 gallon. 



7.61 



7-5" 



7.42 



7-33 

 7.24 



The above table of densities is given for convenient reference. 



PEABODY MECHANICAL ATOMIZER. 



In the light of our experiments begun in 1907 we have come to believe 

 that the best rotative effect on the oil is produced by the tangential delivery 

 method, and it seems plain that the best way to reduce friction is to reduce 

 the amount of surface to which the oil is exposed in its travel through the 

 burner after it begins to whirl and until its exit from the tip. We have also 

 come to attach great importance to simplicity in everything connected with 

 oil burning and believe that the oil burner itself should be of simple con- 

 struction, easily taken apart, and so designed that when taken apart all the 

 small passages and wearing surfaces will be exposed for inspection, cleaning 

 and repair. 



The results of the writer's efforts to construct a burner to meet these re- 

 quirements are shown in Fig. 9, Plate i. Oil is delivered under pressure to 

 an annular channel cut into the face of a nozzle upon which is screwed a tip 

 having a very small central chamber communicating with a discharge orifice. 

 Between the nozzle and the tip a thin washer or disc is inserted and held 



