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Washburn, F. E. (ed.) / The Wisconsin engineer
Vol. 5, No. 2 (May 1901)

Goddard, A. L.
Laying out a valve gear diagram for a Corliss valve air compressor,   pp. 183-188


Page 183


       Valre Glear for Corliss Valure Air Compressor.     IS1
lege by the writer, and the showing is the best yet made by any
coals so far tested.
               Kind of coal.           eEvaporation perPer cent,
                     Kind of coal.     ~~~lb. of coal, fromof ash.
                                         and at 212'1 F.
Red Lodge, nut...........................................4.11 lb.  21.95
Bridger, nut.............................................3.95 lb.  20. 95
Bridger, lump............................................4.98 lb.   19.M6
Chestnut, washed......................5.................5.18 lb.  22.77
Trail Creek, lump.........................................35.38 lb.13.47
Trail Creek, mine run....................................4.63 lb.  21.:33
LAYING OUT A VALVE GEAR DIAGRA-M FOR A COR-
             LISS VALVE AIR CO)MPRESSOR.
                 A. L. GODDARD, '96, Camden, N. J.
   Corrections to previous article: Fig. i shows, not a full Cor-
liss valve air compressor as stated, hut a half automatic compres-
sor with Corliss inlet valves. On page 24, fifth line from the
bottom, gamma should be Y. In the last line on this page, .542
should read .524.
   We have now to lay out the valve gear diagram showing the
lines of the eccentrics, levers and rods for operating the valves
in such manner that the cards taken from our compressor wouldI
resemble our compression diagram, Fig. 5. We will begin with
the L. P. compressor cylinder.
  The events of the stroke should be, starting with the crank on
back dead center: Back end inlet opens at .oi stroke or '2 inch
from back end; crank end outlet opens at .524 stroke or 25.I5
inches from back end; back end inlet closes at forward end of
stroke; crank end outlet closes at forward end of stroke; crank
end inlet opens at .01 stroke on return; back end outlet opens
at .524 stroke on return; crank end inlet closes at back end of
stroke; back end outlet closes at back end of stroke.
  To operate the valves, we have two eccentrics, one for the out-
let valves and one for the inlet valves.  The eccentric rods E
connect to carrier arms at 13 and C, which multiply the motion
and transmit throtg-h side rods F to the wrist-plate side rod pins


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