Coast Survey Report for 1853. - 209 
in their pendulum-vibration times: one governor was at Cam- 
bridge and the other at Haverford, Penn. The result of scrupu- 
r. G. P. Bond has reported in considerable detail, (Appendix 
No. 34,) on the computations of the chronometric expeditions of 
vations for local time and for evolving errors of observation. He 
discusses the micrometric and level division values, the azimuth 
and collimation errors, lateral refraction, personal equations, clock 
errors, the position of the mid wire of the transit, the pivot figures, 
the errors of comparing the chronometers with the standard clock, 
and the irregularities of chronometer and clock rates. The gen- 
eral results of the computations have since been submitted to the 
American Association at the Washington meeting, when Prof. 
Peirce announced additional discussions of moon culmination 
longitude methods, in reference to the longitude of America. We 
are now near the final fixation of the standard longitnde differ- 
ence between our system of connected stations and that of Eu- 
‘ope: which difference once authoritatively established, will 
doubtless be liable to no future change, unless by submarine 
telegraphic determinations. 
_ Geographical Positions.—In the Coast Survey Report for 1851, 
isa list of 3240 stations, to which an addition of 600 is made in 
the Report of 1853, (Appendix No. 7.) For each of these 3840 
lations, a latitude and longitude is given. Also for each of the 
Hanbutation, being indeed the great trigonometrical consumma- 
aie: 
on of the survey up to the present time. It will prove of wide 
or. 
between the geodetic and astronomical latitudes and longitudes 
ND Series, Vol, XVIII, No. 53—Sept, 1854. 
