314 C. Abbe on the Repsold Portable Circle. 
gent watchfulness on the part of the observer. pie Bol- 
scheff, having charge of the determination of some two hundred 
points in Finnland, “mentioned to me the difficulties that he had 
to contend with arising from the sudden fall in the atmospheric 
omnes during the night, obliging him sometimes to stop 
while proceeding from one station to another, not only to make 
extra comparisons of his chronometers, but by artificial warmth 
to endeavor to 2 halal the influence of the rapid fall in the 
exterior temperat 
Without here fete entering into the details of the methods 
pursued by Colonel Smyssloff in obtaining the final corrections 
for the rates of his chronometers.and the longitudes of his sta- 
tions sie i to Poulkova, we wee note that the twenty stations 
n cover an area of some 135 miles square in the prov- 
inces = Novgorod and St. a uae Rte and the ager rie occu- 
I, 
July 3d. The second left Shit na rie 5th, and visited IV, VI, 
7, 8, 9, Iv, arriving at a Ladoga the 13th of J eres the same 
the one beating 7 seconds a the one used in “observing. 
ee nk in all twenty-nine determinations of time and fifteen 
of lat 
S tude. ’ Longitude Prob. 
Station. pientee error from Peed: error. 
+0/!3. ie 
ar me 8. 
1, yno, 59 15 538 — 0 53-43 0-08 
z menni Polarne, 48 39°8 + 1 28°34 0-07 
3. arm ‘ 58 55 15-7 + 4 44-91 0:09 
4. y, 59 13 248 + 3 25°33 0-08 
5. Sam 59 29 81'S + 8 46-20 0-09 
6. U 59 41 45-9 +3 900 0°10 
59 28 138 +10 761 0°12 
’ 9 16 48 +7 295 012 
9 pie, 59 88 43-6 + 7 1061 0-10 
ke, 32 412 3452 010 
11. Taykvayn, 59 38 485 412 44:35 0:08 
, 59 14 32°2 +12 52°73 0-10 
13 var Go 5 +11. 7:87 
