140 A 1,650 HORSE-POWER GASOLINE FIRE BOAT. 
Summing up, the city of Jacksonville has secured, at a cost of less than $70,000, a fire- 
boat of 7,000 gallons per minute capacity and a speed of 15 miles per hour, with a displace- 
ment of only 110 tons and a draught of 7 feet. 
No quarters are provided on the boat, the crew being quartered in a station house ee 
alongside the slip where the boat is stationed. 
TABLE OF DATA. 
Wencth of mull (feet) ewe ies 110 Number propelling engines .......... 2 
Breadthvorlellig (eet) eecuscee acer 14 Number cylinders each engine........ 6 
Depthionehullls Gieeh) ras ererere eer: 8 Bore of cylinders (inches).......... 10 
Drauchtitonwarducrs sa stna cess 5 sche 7. “Stroke® (inches) tacieec cinta eee 11 
Prachi teatt war dacc tbs ne aceeacnt Lets 6' 6” | Speed (builders’ rating) (r.p.m.).... 460 
Displacement (tons) wens nese cra 110  Horse-power (builders’ rating)....... 220 
Length of machinery space (feet)..... 50 Diameter of propeller (inches)....... 48 
Width-of machinery space (feet)..... IW6 > Pitchor propeller (Gnches)-e ae 42 
Hecht of machinernysspace) (deeb)... 4)) les eNumber of bladesa.e es. eel 3 
Projected area of blades (%)........ 32 
Numberofipumps eee mecca eee 4 
Ay PEs Ge Mee pays sten tet te Three-stage centrifugal 
Size’ (inches) tee crosincsinne acerca) weve 8 
Speedia(rejpsma)it sy aaeteon eae 1,000 to 1,500 
Capacity (gnipsm) sl. cnetwrcmauencntee 1,750 
Number of cylinders each motor....... 8 
Bore of cylinders (inches)...........- 534 
Strokel (inches) ifsc: ices oc anierceeis 634 
Horse-power (builders’ test) 1,500 r.p.m. 300 
The general arrangement of machinery is shown in Figs. 1, 2 and 3, Plate 44, of accom- 
panying plans. The special arrangements of pumps and piping, as well as the method of 
joining steel work to wood, is shown in Figs.4 and 5, Plate 45, which are sections through 
seacocks and pump suctions respectively. Fig. 6, Plate 46, is a diagram showing pump 
performance. 
Trial tests made since the boat has been co npleted have been very satisfactory ; a speed of 
12 knots was obtained without exceeding 425 revolutions of the propelling engines, which, 
under full power, gave 475 turns. At full speed ahead the boat was brought to a complete 
stop in less than one and one-half lengths distance and 22 seconds time. A complete turn 
was made at full speed in a 125-yard diameter circle. The boat also answered the helm 
while backing with both engines. 
Two-hour tests of the pumps by the underwriters’ representatives gave a sustained capa- 
city for each of the four pumps of over 1,500 gallons per minute at 150 pounds pump pres- 
sure, or 20 per cent above contract requirements. Two full 3-inch turret streams were sus- 
tained at 160 pounds pressure, and one 3-inch stream was projected vertically over 330 
feet with 250 pounds pump pressure. The accompanying photographs show some of these 
performances and also show the arrangement of machinery and pumps in engine room. 
(Plates 47 to 52.) 
