24 Barus and Strouhal— Viscosity of Steel. 
TABLE 32.—APPARATUS (tubular) V. 
20,—0-19e": , 
R=260™; D=22™, Rods: No. f, brass tube, 4 apo m. No. 41, steel, 
apiece 2 < 
annealed 450°, 1", 2p=0-082°™. =0°0155¢™ ; g=0°0054e" ; Q/aq=2"b. 
Date. o x 108 ho @o x 10° Date. @ x 103 | ho @o x 108 
99/7, 383gm|"__.. | 40-00; .--. ||28/7, 9%32™| ~1-476| 120-14) 0-392 
3 48 3°602 O17) +0°032 ie ff} 1°498 
5 39 3-541| 2-02| —0-029 4 26 1502 
93/4, 754m| 3-465) $16-27) — 0-105 12 48 1-518 
12 02 3°435| 20:40] —0°135 4 33 1-521 
23/7, 128 57™ 1:026} *0-00) —0:074)|30/7, 9201™ 1-651) *167'°90) 0-533 
3 347 1:147| 2°67) +0-047 1 15 1-654 
24/7, 9228™| 1-289) 20:52| 0-189 4 16 1660) 
Eo uTee03 1:300| 24:10) 0-200)/31/7, 9854™|  1-671/191:94, 0-572 
4 23 1:307| 27-43] 0-207 12 44 1-672| | 
26/7, 9%08™| 1:398] 6818] 0-298 ges 1-672) | 
ye aly 1-409} 71:33]  0-309|| 2/8, 9204™| 1-689) 239-95) 0-592 
3 58 | 1:417| 75:02) 0-317 he Dy 1-692) | 
27/7, 9208™| 1-433] 95°71| 0-337 4u 1°695) 
12 38 1:437 5/8, 1242™| 1°727|338°63) 0-627 
4 13 1441 5 27 1727 
* Adjusted anew. + Total twist w,—(W,)=180°, twist of steel positive. 
t Total twist— wv, +(+;)=180°, twist of steel, negative. 
TABLE 34.—APPARATUS III. 
R=370"; L=26™; 1<0-2™. Rods: No. 51, soft, ~=—180°; No. 52, an- 
nealed 450°, p==+180°. 2p=0°082.™ 
Date. @x10? | Ro | box 108 | Date. | 6x 102 | ho | bo x 108 
20/8, 12h 35™ no 0°00 ue Dad SMa 0°581; 92°80 0-027 
12 50 0-291} 0:25) —0-004!| TOM pe HO:568 
6 44 0°306 6°15 +.0°011) 9678, gh Jom 0°568| 115-40 0-014 
PE EOE 0-314} 20°53 0°019)| 4°08 | 0°556 
2 Seo aps + 0:00 | i, 36 | 07530 
_ 5 25) 0°546) 0°16) — 0-002/987g, 9820" | 0-530] 164'87| 0-023 
7 08 0°551| 1:88] +0-003| 6 5B.|  0°520 
22 Som 0°556) 16°70 0°008)!99 78, 105 12™ | 0°515| 188:99| —0-037 
6 54 0-561] 25°65) 0-013 6 17.| 0-504 
eH 0-561) 48°36 0-013 
24/8, 9218"™| 0-581! 68:00] 0:033|| | 
5 13 | 0-581 | 
_* Adjusted r—b—f. + Re-adjusted 7+0+/. 
We have not yet made the tubular apparatus as sensitive in 
its indications as is the bifilar. The results are nevertheless 
sufficiently sharp and pronounced and are cited here for their 
important bearing in the inferences to be drawn for steel. Fine 
glass tube is to be preferred to brass. 
