272 PROCEEDINGS OP THE AMERICAN ACADEMY 



the bubble, and the time, were then recorded. The telescope was next 

 directed alternately to the distant and near mountains, five times to 

 each, and the screw readings recorded. The level was then again 

 observed. These measures constituted one set. Sometimes a third 

 mountain was also observed, and sometimes the level was omitted. 

 Care was taken never to move the telescope horizontally during a set, 

 and when several points were observed, they were always measured in 

 the same order. 



Table I. gives in the first column the Greenwich mean time, ex- 

 pressed in hours and tenths, the beginning of the day being taken at 

 Greenwich noon. The second column gives a designation for the 

 object pointed at ; and the third gives the corresponding mean of the 

 readings of the micrometer screw. L is used to denote that the tele- 

 scope was level, and the reading in the third column is here corrected 

 for the position of the bubble. The objects belonging to the same 

 set are indicated by placing the time opposite the first only. 



The various designations in the second column have the following 

 meanings : — 



B. Barrett Hill. Top of trees on hill nearly in line with Moosilauk 

 and Kearsarge (S.). E. Mt. Equinox. G. Gunstock. Gp. Gap Mt. 

 Gr. Greylock. J. Joe English Hill. K. Kearsarge (S.). The ob- 

 ject observed was the base of the house, a short distance from the 

 summit. This is apparently the house which has been destroyed, and 

 not that now standing a few feet only from the summit, Ki. Killing- 

 ton Peak. L. Level, as stated above. M. Moosilauk. Mn. Mo- 

 nadnock. P. Passaconnaway. Pi. Piscataquog, the hill nearly in 

 line with Whiteface. W. Whiteface. 1. Summit of Kearsarge (S.). 

 2, Top of house on Kearsarge (S.). 3. Summit of a cloud-dome, pre- 

 sumably over Mt. Washington. 4. Northwestern of the Uncanoonucs. 

 5. Southeastern of the Uncanoonucs. 6. Cupola of Barnard House, 

 Arlington Heights. 7. Roof of barn placed in right-hand part of field 

 to determine inclination of wire. 8. Roof of barn in left-hand part of 

 field. The two sets in which this object was observed showed that the 

 inclination of the wire equals 0.6 division for l°.l, or about 8" per 

 degree, including error in level. 



