P. E. Chase on influence of Gravity on Magnetic Declination, 85 
V. “The general character of the diurnal motion ... is 
nearly the same throughout the year; the most eastern deflec- 
P.M. and 3 feature which is also shown by the annual 
type-curve.” [Ibid., p. 20. Comp. Hobarton Obs., 2, vi; St. Hel 
bs., 2, exi, exi x: Toronto Obs., I, xiv, 2, x 
alue, is 81 minutes in the former 
and 28 minutes in the latter.” [Ibid., p. 21.] 
. The curves of lunar-diurnal variation “show two east 
h ay be 
the lunar-magnetic interval for the Philadelphia Station. At 
Tbid Bee) eee 
— in the 
Junar-diurnal variation is a much smaller amplitu inter 
than insummer. Kreil, indeed, inferred from the ten year series 
of the Prague observations, that in winter the lunar- urnal va- 
