. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ve 60,000, hauling any train within its capac- ioc 90 PARTIAL THROTTLE ^1 JL Xr- —T ?^ 07 «0 9 S2l t 1 ^ Vu _L HROTTLE >-UJ ^ ft? **i y£ 70 i ^ 0 T < rf* uj O 60 Z 5 io DO 10 000 20 000 3q ooc 40 poo 50 poo GC00C 7C0O0 80 ♦ I20 I60 • 200 Relation Between Machine Efficiency and Draw-Bar Pull itv. the speed can be increased from 15 miles per hour to25 miles per hour with practically no change in coal rate. Throttling Tests Five tests were made to determine the
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ve 60,000, hauling any train within its capac- ioc 90 PARTIAL THROTTLE ^1 JL Xr- —T ?^ 07 «0 9 S2l t 1 ^ Vu _L HROTTLE >-UJ ^ ft? **i y£ 70 i ^ 0 T < rf* uj O 60 Z 5 io DO 10 000 20 000 3q ooc 40 poo 50 poo GC00C 7C0O0 80 ♦ I20 I60 • 200 Relation Between Machine Efficiency and Draw-Bar Pull itv. the speed can be increased from 15 miles per hour to25 miles per hour with practically no change in coal rate. Throttling Tests Five tests were made to determine the effect on theeconomy of the locomotive of a reduction of the pressurein the branch pipe by throttling. The method of makingthese tests was to throttle the steam at the steam chest to 200 or 250 pounds, and to lengthen the cut-off until thedraw-bar pull was the same as in a previous test at thesame speed with full throttle. The results of these five. SPEED FOUIVALENT OF MILES PER HOUR—Fig. 13. Relation Between Draw-Bar Pull and Speed for Various Cut-Offs tests are shown in the table on page 71 in comparisonwith the corresponding full throttle tests. The following Engine Performance Pressures from Indicator Diagrams, Averages. Pounds per Square Inch t 5 3 Steam Chest §3£ Pressure Initial Pressure Pressure at Cut-offLeast Back Pressure j- Pn aj . w o v> - ou . He* 5 zf. iss §.£ ■S3?Sg-S * v S O »- u O U —&J? >• 04O 1 £ 0 >- V, oS-| ■0 *•3° F-H £w ° I Dry Coaper I. HourLb. « • £ t-H la 43b 43b 43c 43c 43d 43d 43e 43e 44 44 46 7912 80-50/20-F .... 335 160 348 158 248 114 159 1 1471 7910 80-60/30-F ... 335 160 347 165 263 123 164 2 1763 7911 80-70/40-F ... 335 170 351 173 273 127 172 2 2164 7906 80-80/50-F ••■ 325 170 353 175 282 130 167 5 2560 7922 80-90/7O-F .... 330 165 357 165 306 138 164 6 3034 7917 120-50/20-1 ... 340 160 35
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
