410 
PROFESSOR 0. REYNOLDS AND MR. W. H. MOORBY 
which makes the correction factor 
(1 - 0'000339). 
On the mean value of K deduced from the trials, I propose to make this factor 
(1 - 0-00037). 
63. (b.) Gexera.tion of Heat in the Water on account of the Loss of available 
Head between the Supply and Discharge Pipes. (Part I., par. 53.) 
1200 ft.-lbs. 
600 ft.-lbs. 
400 ft.-lbs. 
Head iu supply pipe in feet of 
water 
17-0 
12-45 
10-98 
Loss of head before reaching the 
discharge pipe in feet 
5-7 
1-15 
-0-32 
Correction required by the work 
5-7 
1-15 
-0-32 
given in the tables per cent. 
1-8 X 777 
= 0-0041 
1-8 X 777 
= 0-0008 
1-8 X 777 
= -0-0002 
Therefore the correction factors required are— 
(a) For the 1200-600 ft.-lb. determinations 
1 + 
0-000041 - 4 X 0-000008 
1 . 
= (1 + 0-000074). 
(yS) For the 1200-400 ft.-lb. determinations 
^ 0-000041 - ^ X 0-000002 ^ 
3 
This factor also I propose to give the value 
(1 + 0-00007), 
when applied to the mean value of K deduced from all the trials. 
VII.—Correction due to the manner of Engagement of the Eevolution Counter with the 
Engine Shaft. (Part I., par. 34.) 
64. The spindle of the counter carried a wire pin parallel with the axis of 
revolution, which pin was driven by another carried by, and passing at right angles 
through, the axis of the spindle making connection with the engine shaft. 
