Pocketbook of Useful Formulæ and Memoranda
for Civil and Mechanical Engineers

489 OF ENGINEERING FOKMULÆ. High-pbessubb Engines, with Vertical Boilers, Nominal Horse-power. 2 4 6 8 10 12 Diameter of boiler .. 2'6" 3'3" 3' 9" 4' 6" 4' 9" 5' Height of ditto .. 5' 6' 9" 8' 8'6'' 10' 11' Diameter of cylinder 5" 1" 9" 10" 11" 12” Length of stroke .. 8" 10" 11" 12" 13" 14" Revolutions per min. 200 150 135 125 115 110 Weight packed (tons) « 2i 5 U Portable Engines (Single Cylinder). Diameter of cylinder, ins. Length of stroke, ins. .. Revolutions per minute .. Weight in tons, packed .. Nominal Horse-power. 4 6 j 8 | lOj 12 6-i 10 150 3 8 9 1 10 , 12 12 13 I 14 | 15 125 1 115 ! 110 100 44 5J- j 6 6j Portable Engines (Double Cylinder). Nominal Horse-power. 10 ( IS I 20 25 j 80 Diameter of cylinder, ins. Hi •> ™ 12 \ Stroke in inches .... 12 I 13 14 16 18 Revolutions per minute .. 125 i 115 110 95 85 Weight, packed, in tons .. 6 1 ‘i Hi) 12* 15 The weights given in these Tables are only approximate,