510 E. P. TAYLOR. 
with those of the retardation tests, and it was possible to 
isolate the value of the gas friction. , 
There remained, then, the separation of the friction at 
the connecting-rod bearings from the piston friction. For 
this purpose it was assumed that the proportion of the 
connecting-rod friction to the main-bearing friction would 
be as their respective areas. This assumption becomes 
more correct the nearer the lubrication of the surfaces 
becomes perfect. 
11. Statement of Results.—A table of results shows this 
process of separation from first to last. 
Retardation Tests on 40 H.P. National Gas Engine. 7 
Retard-| Frict. ae Distrib. 
Part of Machine. nN | ation | Torque of 
No. id T_27In 27 N Friction 
“550 {per cent. 
. 
"0062 
1 | Engine fully assembled| 1 
Full compression Zz 0097 
Cylinder temp. 125° F.) 3 | :0127 
2 |Main bearingsandvalve| 1 | :0014 
gear(afterunshipping| 2 | :0021 
con. rod) plusdynamo| 3. | ‘0027 
bearings. 
3 | Main bearings and 1 | 0013 
dynamo bearings. 2 | 0019 
3 | 0025 
4 | Dynamo bearings. 1 | :0004 
2 | :0005 
3 | 0006 
5 | Piston, connecting rod; 1 | :0048)| 58 
and ‘‘gas friction.” 2° OOO") 485 
(1) -— (2) 3 | :0100) 122 
6 | Main bearings only 1 /-0009] 10 | -114] 15 
(3) -— (4) 215) “ODT Ad Ealee "39 16 
2 a) SOO1L0 ee? "75 15 
