XXXVIII GEELMUYDEN. ASTRONOMICAL OBSERVATIONS. [NORW. POL. EXP. 
Pickering Barnard Michelson 
Ib 1.00 1.00 1.00 
IL. 0.94 0.83 0.92 
Ii. 1.18 1.46 1,34 
IV. 0.70 1.37 1.28 
It is apparent that the albedo of III is really somewhat smaller than that 
of I and II. For IV the difference is very considerable; the above values of 
« point in the same direction, but by reason of the paucity of the observa- 
tions they are too uncertain to permit any comparison with Pickering’s results. 
The solution of the equations for I, II and III on the supposition named 
above gave the results: 
For I, I, WI D: « = 0.178 + 0.4038 
- J, I, WR: 2» = 0.4263 + 0.%034 
For combination with the already calculated values of the velocity k 
they were again converted into parts of the Satellite’s radius as follows: 
D R 
I. 0.340 0.501 
Il. 0.408 0.601 
Ii. 0,234 0.845 
For Sat. IV the values of @ must be retained as they stand. They are 
not of much importance for the present purpose. 
The next step was to apply the values of & to the observations of 1893 
—96 in order to reduce them to the aperture of the Fram-telescope by means 
of equation (7) and to compare the reduced times with the predictions of the 
Nautical Almanac. The results are contained in Table b where A’ is the 
2 
aperture employed, a’ means the function |e — 1, T’—NA is the diffe- 
rence between the observed and the predicted time, 7’— 7’ the reduction as 
calculated by equation (7), and T—NA the correction which must be applied 
on the times of the Nautical Almanac in order to make them applicable to 
the Fram instrument. The list contains all the published observations exclu- 
ding only those in the years 1893 and 1896 which fall quite outside the arctic 
observations of the phenomenon in question. The remarks which in many 
cases are added to the original observations, were omitted; only a: after 
the number indicates some source of uncertainty as haze, bad images, twi- 
