. American engineer and railroad journal . r pressures varying by 10 pounds from 160to 250 pounds per square inch. The piston speed should not exceed 1,400 feet per minuteunder ordinary conditions. For economy the maximum speedis about 1,100 feet. JUNii, liiOO. AMERICAN ENGINEER AND RAILROAD JOURNAL 177 - 3o«ck Lines SoliiLinlt Represent ^ 1400 ft. per Repreicnt1100 ft. per Minute for DifferentStrokes Mi lutc for Different Strokes , -(— a 8 3 100 ^ g a « 1 e? 1 1 t /^ / -- ^ / / •0 00 ,A. /, .^ X ^ u C^ / >^ -.^ It 60 1 K y n 1 Ay K i--^ ^ ill y / / i^ ^ / ^ ot Li /• / ^^^^T^^ 60 X ■■ / ■^
. American engineer and railroad journal . r pressures varying by 10 pounds from 160to 250 pounds per square inch. The piston speed should not exceed 1,400 feet per minuteunder ordinary conditions. For economy the maximum speedis about 1,100 feet. JUNii, liiOO. AMERICAN ENGINEER AND RAILROAD JOURNAL 177 - 3o«ck Lines SoliiLinlt Represent ^ 1400 ft. per Repreicnt1100 ft. per Minute for DifferentStrokes Mi lutc for Different Strokes , -(— a 8 3 100 ^ g a « 1 e? 1 1 t /^ / -- ^ / / •0 00 ,A. /, .^ X ^ u C^ / >^ -.^ It 60 1 K y n 1 Ay K i--^ ^ ill y / / i^ ^ / ^ ot Li /• / ^^^^T^^ 60 X ■■ / ■^ / y y k 1^ 1^ >^ ■^ _^ 31 o. — / y y/^ y y ^^ /^ P ^ >^ ^ U^ / /: -; ^ y >-k\ -^ -^ / ■A :> X^ ^ yy y y ^ Ji^ T ! J-^ -^ a ID 1 /^ >^ -i^ X y ^ ^ > I ^^^ ^ ■^ ^-- 3« / ^ ^ k^ ^ O - ; ^ ^ .^ :^ ^ r^ ^- ^ ^ - ^ r^ ^ 1$^$^ fe ,^ ^ . _^__ - ^ 11 .^^g^$ —t— 1 i ^ 1 400 500 COO TOO SOO 000 Piston Speed Feet per Minute 24 Inclj Stroke Fig. 3 100 90. 30 30 10 PERCENT AGEOF SPEED 10 TABLE NO. 2. Mean Effective Pressure. Boiler Pis ton 3pee a feet per minute. pres- sure. 1 KKl 200 300 400 500 600 700 800 900 1,000 1,100 1,200 1,300 1,400 UK) 01 S6 SO 73 65 .57 .50 40 37 32 30 28 160 116 138 128 1!7 104 91 8( 71 64 59 55 5 48 45 1711 U6 136 121 11(1 97 K 76 68 63 58 54 51 48 18U 164 144 131 117 103 % 80 1 72 67 62 58 54 50 liW 17H 163 152 1S9 13 ins 95 84 ! 76 70 61 D( 53 •_Ofl IS? 172 160 146 13(1 114 KKl 89 ; 80 74 69 61 60 56 210 191 1S1 168: 153 137 120 1(15 93 1 84 78 72 67 63 59 i2n ?no 189 176, 161 126 11(1 9S 88 SI 75 70 66 62 230 ^09 I9H 184 IPS (1 131 102 92 85 79 74 69 61 240 ?1S 306 193 175 137 22( 1(17 96 89 81 77 67 227 215 200 183 162 142 2i5 111 100 92 86 80 lb 70 Miles per Hour Fig, 4 100 The effect of long pipes in erroneously increasing the sizeof indicator cards at high speeds is clearly shown by ProfessorGoss, of Purdue University, in a paper before the AmericanSociet
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