392 E. 8. Holden—Measures of the Rings of Saturn. 
Observations of Saturn’s Dusky King made with the 154-inch 
equatorial of the a gab Observatory in 1881 and 1882, 
reduced to A=9°53 
f 
No.| ast.” iv ’ * of keel MS) GH 
20 |\Dec. 8 a 27°81 Bis 260. 3 (|cloud’d 
21 GRIER 6-35 mre’ 666 |!260 3 | 40°31 
2 be ao 6-34 none 655 || 430| 3. | 40-21 
23 14 eae gn 6°52 Waele 6-70 430; 2 | +0°18 
4 17 ae 6°62 ee 6-80 ||430 2 | +018 
15 ial po 6-36 Ge 660 |/430 2 | 40-24 
6 me 6-41 ee 7-02 || 430| 6 | +0-55 
1 rr ers 6°15 aa 615 || T*! 5 | +0-00 
8 26 6°52 a 6-78  ||750| 4 | 40-26 
9 26| 27-80 ee 27° _... || 150] 4 | 40-08 
0 98, 28°35 cas 28-25 oe 750| 1 | —0-1 
31 os sien 6-76 ven 6-94 |/430 2 | 40-18 
32 31 ae 6°83 682 ||430| 4 | —O-01 
33 27-96 oe 28°05 _... |[430| 4 | +0-09 
1882 
34 |Jan. 27-96 27-98 430 4 | 40°02 
3 ot ee 6-47 pe 686 ||430 3 | 40-39 
28°15 pes 28:26 pee Pt re eet 
37 |Feb. 6| 27°89 Ree 28°03 a 260| 3 | 40-14 
27°83 ie 28:23 _... || 260] 3 | +0-40 
Means, 27°99 ++ 0050/6-49 + 0°040/28-05 + 0°041/6-63 40-051 +018 
No. obs.| (7) (11) (8) (11) | (18) 
I can say that the Washington observations were made un- 
der good circumstances, with sufficient magnifying powers and 
accidental side are materially less than those of the Geneva 
ar, 
not explained. A constant difference between the width of 
the rings Ban west and east is uniformly shown in both 
the Geneva and the other series. 
e greater precision of measures having 7 as a terminal 
point will ee noticed and it agrees with remarks made in my 
observing bo 
i aatie to M, Mayer 1880; ef—li =+0"-46 
According to Washington : 
According to Washington 1880; =-+ 0°10 
According to Madison 1881-2; =+ 0°18 
It is ropa remarkable that the four entirely independent 
of observations agree in giving a value of ¢f materially 
larger than i, In the case of my own observations, I have 
* Terrestrial _— magnifying about 240 diameters. This power is too low 
for satisfacto 
