49 REPoRT—1885. 
For K, take No=Y; 
Ny —Ny= — 2n= — 0°'0821372 per hour. 
0:0821372g=14-9589314r, 
If r=2, g=364'24. 
Hence we should complete the row numbered 364. 
For O, take N= y—2e, 
Ny —Ng=2(o—n) =1°'0158958 per hour. 
1:0158958¢=14'9589314r. 
If r=25, g=868'12. 
Hence we should complete the row numbered 368. 
It is better to abide by this, for in the former case n,—m» varies very 
slowly ; and we may be satisfied that on stopping with row 368 the effects 
of O and K, will both be adequately eliminated. 
The J Series. 
Here Ny =y+o—c7=15°'5854483 per hour. 
To minimise the effect of Ky, 
No=Y73 
Ny —N =o —w@=0°'5443747 per hour. 
0°5443747q=15°58544337. 
If r=12, g=343'56, and r=13, g=372°19. 
To minimise the effect of O, 
no=y—20, 
N\—Ny=30 — @=1°°6424077 per hour. 
1°6424077q=15°58544337. 
If r=36, g=341'6, and r=39, g=370°09. 
Since in the latter case n,—n, varies three times as fast as in the 
former, it will be better to abide by this,and stop either with phe row 
numbered 342 or that numbered 370. 
The Q Series. 
Here 2, =y — 30+ a=13°3986609 per hour. 
To minimise the effect of K,, 
No=Ys 
2, —No= — (30—a@) = — 1°-6424077 per hour. 
1:6424077q=13°3986609r. 
If r=38, g=310-00. 
To minimise the effect of O, 
No=y—2e, 
N\ —Ng= — (o— 7) = —0°'5443747 per hour. 
0°5443747q=13°3986609r. 
If r=12, g=507°36. 
Since in the former case n,;—, varies about three times as fast as in 
