126 A. A. Michelson—The relative motion of the Karth 
others the springing of the tin lantern by heating) the fringes 
would suddenly change their position, in which case the series 
of observations was rejected and a new series begun. 
In making the adjustment before the third series of observa- 
tions, the direction in which the fringes moved, on moving the 
elass late b, was reversed, so that the displacement in the 
third and fourth series are to be taken with the opposite sign. 
At the’end of each series the support was turned 90°, and 
the axis was carefully adjusted to the vertical by means of 
the foot-screws and a spirit level. 
N. NB. E. | S.B. 8. Sw. WwW. | NW. Remarks. 
Ist revolution} 0-0! 0-0) 0:0|—8-0|—1-0|—1-0|—2-0|—3-0|Series 1, footscrew 
2d o 16:0} 16°0| 16-0} 9°0| 16°0| 16-0] 15-0) 13°0| marked B, toward 
3d “ 17:0, 17-0) 17-0; 10°0) 17-0; 16-0) 16-0) 17°0| East 
Mth. {# 15:0) 15°0' 15-0] 8-0) 14°5| 14°5| 14°5| 14°0 
ath st 13°5| 13°5| 13°5| 5:0} 12°0) 13:0) 13-0} 13-0 
615) 61°5 61°5) a@ | 58°5| 58°5| 56°5| 54-0 
S.| 58:5) W.) 56°5 N.E| 61°5| S.E.| 60-0 
120°0 118°0 1120-0 1140 
118-0 1140 
i 
Excess, +2°0 
Ist revolution 100] 11-0} 12°0| 13-0} 13°0| 0-0| 14°0| 15-0/Series 2, B toward 
2d Ne South. 
6°0| 16:0) 16 7-0} 17-0) 2°70) 17-0} 17-0 
3d i i 17°5) 17-5) 17-5] 175) 4-0) 18-0) 17°5 
4th & 175} 17°5) 17-0) 17-0} 17-0) 4:0) 17-0] 17°0 
5th “ 17°0| 17-0] 17-0} 17-0] 16:0) 3:0) 16°0} 16°0 
78:0} 79-0) 79°5| 81°5| 80°5| a | 82°0| 82°5 
S.| 80°5| W 1) N. K,} 81- 
80°5 E,| 79:0) § 5 
158°5 1615 160°0 164-0 
615 164-0 
Excess, = '—3-0 ‘4:0 
Ist revolution} 3:0] 3-0) 3°0| 3-0] 2:5! 2:5! 2-5! 10-0|Series 3, B toward 
2d “ 18-0} 17°5| 17-5} 18-0} 18°65] 19-0] 19°5| 26°0| West. - 
3d “ 11-0} 11-0) 13°0| 12°0| 13-0) 13-5) 13-5] 21-0 
4th “ 10; 0°70) 0-5) 0-5] 05) 0-0) 0-0) 14-0 
5th us 40} 40) 50) 5-0) 5 5°5| 5°] 16°0 
37°0| 35°5| 39°0| 38°5| 39°35! 40°5| 7 
S.| 39°56] W.) 41:0 35°5| S E.| 38°5 
165 80°0 76-0 19°5 
765 760 
Excess, +3°5 +3°5 
ant revolution leo 21-0] 15°5| 17°0| 14-0] 14°5| 14:5] 16-0\Scries 4, B toward 
0} 12°0) 13°0} 13-0] 13°0) 13°5| North 
. ) 
5 
0 
3d Ms ics 15°0} 16-0) 16°0) 16-0} 16-0) 17 
4th a 18°0) 27-0} 18°5} 18°56) 18°5| 19-0] 20-0! 21-0 
oth «“ 15°0| 24:0} 15-0} 15-0) 15-0) 16-0] 16°0| 16-5 
71-0} a | 76°0| 78°5| 76°5| 78-5! 79-5) 84-0 
S.| 765} W.) 79°5 E.| 73:5] S-E.| 78:5 
M75 155°5 152-0 162°5| « 
1475 152°0 
Excess, +80 +10°5 
