RECENT ADVANCE IN OIL BURNING. 155 
Vessels. Gross tons. 
ADfaallke=yes! (exoyel WAN A Ea UNA AIa a a RUMMY MUN vasa 
Maer OU SAN oine elle ANY SMALL: 121 830,964 
Manikers coalhangsoi ase nee DBD ANN INLia actA 
Tanker, non-propelled......... 19 11,991 
140 842,955 
Grand total, 383 vessels; 1,438,498 gross tons. 
“6. Summarizing, we find :— 
Per cent. 
Coals uEMe rs LM see ES URC) CARMA A RES 5.2 
OFM Toy bhrsg Tees} UN te Cec UUM ACU SANA LE TAN LIBRA on CD a 58 
Coalvandroiltipurnerse aye ek ike esi Bo4l 
None propelled et iakieie Maia Siu dale ldbd ial RMT, 33-4 
“7, Applying these percentages to the 960 ships in question, we find: — Coal 
burners, approximately, 48 vessels; oil burners, approximately, 555 vessels; the 
balance being mainly non-propelled. 
“8. It is interesting to note at this point that of the tonnage (steel) now build- 
ing to private account, more than 58 per cent is made up of tankers. 
“9. Recapitulation of the above data brings out the following:— 
Operating: 
Vessels. Per cent. 
Coal burners, approximately... . 993 37.8 
Oil burners, approximately..... 1,260 48 
Balance (mainly non-propelled). 369 14.2 
American vessels............. 2,622 
“(Signed) CROWLEY, 
‘Statistician, ABS.” 
Thus, while very large vessels are using oil fuel successfully and from the esti- 
mate of the American Bureau of Shipping it is evident that nearly 56 per cent 
of the present American self-propelled merchant fleet consists of oil-burning vessels, 
it is probable that in not one of these ships is there a boiler containing more than 
4,500 square feet of heating surface in the individual unit and no single oil burner 
capable of atomizing over 600 pounds of oil per hour, while the oil burned per 
hour per square foot of heating surface under forced-draft conditions will not equal 
one-half pound. 
In other words, the present boiler and oil-burner practice in the merchant 
marine is following closely along the very conservative lines of previous custom, 
and the full value of the use of oil fuel has not yet been approached. Owners 
and designers have been content with the many great savings and advantages 
of oil fuel without perhaps realizing all its possibilities in the line of increased 
capacity without serious loss in economy. 
