286 Miscellaneous Intelligence. 
“The fire acts directly against the bottom of the large cylinders. 
When the engine is in full action, the air entering, say at a temper 
ature of 60°, will be heated to 450° on passing through the regenera- 
tor, by taking up the heat left in the regenerator by the hot air that had 
just before passed out; and as 480° are all that are required, the bal- 
ance is supplied by the fire. The air at 480°, on now leaving the cyl- 
inder, is cooled down to 90° F., or but 30° above the temperature befo 
entering. So great is the effect of the regenerator that the temperature 
near the regenerator on the side next the cylinder, and that on the op- 
posite side, in all cases differ by at least 350° F., when there are sufi- 
cient fires in the furnaces. y 
Mr. Ericsson makes the following statements : rich 
“In regard to loss of heat, the result of ample trial has been, that at 
no time has the temperature of the escaping air exceeded that of 
the entering air by more than 30°. As this differential temperature 
exhibits the positive loss of heal, it becomes important to ascertain 
its amount in pounds of coal: the area of the supply piston is 2626 
‘square inches, and its stroke two feet; hence 36,4, cubic feet of atmos- 
_pheric air is supplied for each stroke, and therefore at 30 strokes 1© 
cubic feet, and for both cylinders 2184 cubic feet per minute 131,040 
cubic feet per hour. The weight of atmospheric air is nearly 183 et 
bic feet to the pound, and hence it will be seen that 9706 pounds of alt 
pass through the engine every hour. We know that one pound of _ 
will raise the temperature of 10 pounds of water 1100°; the specific 
38,5 pounds of air will be elevated in temperature 1100° ire 
ound of w the observed loss of heat in the engine pie Seo 
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that radiation will be prevented ; as the machine stands, a horse-PO” 
is produced by a consumption of less than 11 ounces to the horse-poW 
_ er per hour. : aii 
“©The following particulars are of considerable practical importance 
_, “Ast. The valves g and A [for the ingress of air to the are 
der and from it] are not subjected to heat, the ealorie 5°" 
_ taken up by the wires before reaching the valves. mre 
; “2d. The temperature of the ‘aabibig of the working pistons 40% 
not exceed boiling heat at any time. found that 
3d. As only a slow radiating fire is needed, it has been rexndits 
ec her Hibben applied to the under side Oe eee the best 
or Several weeks ; this ively that the € be! 
ii chitin fend this proves conclusively . 
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