G. W. Dean—Longitude Determination across the Continent. 445 
February 17, 1869.— Collimation. 
Star. | Time. | Ce. | C. | c. 
Draconis L. ©. 5 37 | +001 | —2°7 —0004 
w’ Draconis L. 0. 5 44 —0805 —3°273 +°0246 
T, = 6h. 46m. 6 = +12°550. 
‘ Clock and Azimuth Corrections.— Observer A. T. M. 
Star. Lamp.|  («) A w, | A? | Ao’, || Aa | At 
aa W. E.|+12-246| 4+9580| —304| 6-656 |—0-784 || —-312 |12°558 
¥ Draconis (pr) L. C.| E. W.|+12'139| +2°976| —-411} 8:857 |—1°223 ||—360 12°499 
@ Orionis, W. |412:496| +0°578| —-124| -335 |—0-072 ||—-070 |12°496 
¢Geminor, W. |4+12-450] +0-455| — 07 |—0-046 || —-055 |12°505 
€ Can. Maj. W. |+12:452| +1-080} —-098| 1-167 |—0-106 ||—-131 |12°583 
i. Maj. WwW. |4+12420| +1-:037| —-130| 1-076 |—0-185 ||—"1 : 
Geminor, W. |+12-474| +0:372| —-076| +139 |—0-028 ||—- 18 
@ Can. Min. E. 12°500| +0°60 050 3 |—0-030 || —-073 |12°573 
8 Geminor, E. |412:505! 40-276) —-045| -076|—0-012 | —-033 |12°538 
9 Gemin FE. |412497| +0-296| —-053| -088|—0-016 || —-036 |12°533 
1 + 10-262 |—1-391 |18-964|—2-462|| + [12635 
te 10 A? + 10°252 a= —1°391 A@ — °1240 = —°1391 
ry +10°252 AO + 18-964 a = —2°452 Ag = —"015 
A@ + 1:0252 a = —0-1391 
+10°251 A@ 4 ‘if 10 a= —1°426 At = +12°535 + -007 
8-454 a= — 1096 
ene between ae and Omaha. 
[Not corrected for personal equation.] 
a+ Xo No. of a t .} Bao ok 
Date Probable Series of Probable |Series of 
__ 1869. hm s. error, | Signals. error. | Signals. 
Feb. 17, |1 39 15°305| +-018 2 990} +015 3 
HAS, 15°293| +-033 2 1-960 | +°030 2 
“24, 15278| +-028 3 -999| +032 2 
Hared 15°351| 4-015 2 3009 | +015 2 
outhy 15°351| 4-031 1 007 | +°015 4 
oa 15°384| 4-034 1 1-982 | +°033 1 
Mean ah \ 
Xi 2 
Date Probable Probable || Double transmis- 
a. 5 hm 6 error. ||h.m 8 ror. sion time. 
Feb. 17 |3 18 30-295 | +4023 |/13915°147| +°012 08-315 
38 30-253 | +:045 127| +:022 0°333 
“24 30-277 | +043 15138 | +7021 0°279 
ae 30°360 | +021 15°180| +°011 
we 3: 30°3 +034 15179} +017 
‘38 30°366 | +:047 15°183 | +7024 0-402 
Mean | 1 39 15°159 +008 0-366 
Nore.—T h te used at Buffalo and Chicago. 
moe of tlograph wie ae Abit between Cambridge ant and Buffalo, 504 miles; 
and Chicago, 540 miles; Chicago and Omaha, 493 
