176 Miscellanies. 
deeming it unnecessary to add any remarks of my own, farther than to 
express my entire confidence in the accuracy of his determinations. 
Micrometric Measurements taken by E. P. Mason, 
During the progress of the eclipse, frequent measures were taken of 
the distances of the cusps, and the corresponding instants of observation 
were accurately noted. The instrument with which these were obtained 
was an achromatic object-glass micrometer, of Dollond’s construction, 
“attached to a7 ft. Reflector, the value of whose scale had been determined 
by frequent comparisons with an accurate sextant in terrestrial measures, 
and by observations on — of the Ast. Soc. Peet The following 
are the distances obtained : 
Time f Observ ition. ; Distance of Cusps. * ‘Time of Observation. ‘usps. 
iii eae age © “ : hi Wek i N 
26 68 | 10. 23.43 4 14 15.0> 28 33.16 
+ 2 Oh ese *“ 15 129 | 28 4439 
mR 61.2 | 4337.14 © 216.2, 87.7.1 23< 55Re 
“ 30 58.0 | 14. 2811 17 ~ 365 1-99-. 6H 
~- O. 429") 38-57-48 “« 31 363. | 29. &68 
eee 43.7 ° 115” 8592 nearest approach’ 19 13.59 
Pee BE 17 = S18 ‘st 419° | 299 1649 
«38 39.2) 18 936.72 “-53 188 | 29-cfao 
4 42... 22. |. 30 .. 23.52- “ 55 442 | 29 23.38 
Ss 42 185 | 20. 5758 “58 395 | 29 13.26 
eek. 069 | 21. 20-87 5 0. 49.7 | 29 488 
eee" Fae +82 96.54 > ee ee Oe 
SESS BS.7 |} 22 GA: “9 98.0) 28 53.51 
«60 = 379 23° 32:79 “29-764 | 2. 498 
“62. 446 | 24 12.57 *.- 4. 108 | 28 41.66 
ne 54° 168 | 24 38.56. a ok noe |. Se ae 
55. 62.' 24 52.99 8 943 | 99. aam 
“te 481° 1°35 26 = 9 96.0 | 27 Bae 
"68.  83.6°)-25 46.78 “<Tt 243 | 27 ae 
* 59. 180°! 25- 59.69 “ 12 18.7 |:2725e 
“. 59 529. |. 6448 “ 13 404 | 26 56.76 
4 1 550 | 26 27.62 “ 14. $93 | 26 S60 
a 6.0 | 27 46.16 ~~ Si ae 96 16.15 
ae 930°) a ere “. 18. 188° | 2 eeee 
oe 907. | ee “ 19 - 56.1 | 25 37.30 
“, 2 213 | 28 22.52 - a 
A mean of 4 measures, in a direction about 15° or 20° shélinid to the 
horizon, and 20m. previous to the instant of first contact, gave for the 
sun’s diameter 31’ 53.7”. . These were, however, taken amidst the hurry 
of preparation for the eclipse, and were too few in number to be a 
ard for the subsequent measures.. The following horizontal diameters 
may be considered more. determinate, and will serve to show the confi- 
dence which may be placed in the measures of the cusps: 
i 
* 
