378 
Mr. Rumker’s new Method of 
the approximative calculation, the correction for inclinatron 
may be omitted in this method. 
To illustrate this method we shall choose the example given 
by Professor Schumacher in his Ephemeris for 1835, which 
from 21 feet elevation 
come the following : 
ist Example. Jun 
172° 22! E. longitude, 
above the level of the sea would be- 
e 18, 1835, in 23° 57' N. latitude, and 
the following observations were made. 
Therm. 90 Fahr.; barom. 28°6 Engl. 
© Lower Limb. 83 55 35 
Dip — 4 21 
83 51 14 
©’s semid. + 15 45 
App.alt. 84 6 59 
Red. to true zen. + 35 
© Upper Limb. 5 15 50 
Bos et sae tee anee — 4 21 
5 11 29 
C’s hor. semid. 15 4 
Refraction —20 —14 45 vert.semid. 
Parallax +1 
H= 84 7 34 Ap. alt. above hor. 4 56 44 
Reduct. to true zen. +1 23 
EEN G/ 
Observed Distance of Limbs. 
d = 90 17 16 4d= 45 8 38 
semid. © = 7 15 45 r= 15 45 
semid. (« = 7! 14 45 A. =, 39°37 57 
90 47 46 = D 4D= 45 23 53 
A’ = 39 38 27 
Calculation. 
H 84 7 34 
he a8 9 
H+h 89 5 41 4(H+h) 44 32 50 cot 0-006864 
H—h 79 9 27 4(H—A) 39 34 43 tan 9-917318 
4D 45 23 53 cot 9-993966 
A 39 37 57 tan 9-918148 
4D—A 5 45 56 tan 9-0042 3D+A 85 7 50 tan 1-0607 
H 84 7 34 tan 0-9877 hk 458 7 tan 8-9392 
r 15 45 log 29754 7 15 5 log 2-9567 
H’—H_ 15 27 log 2:9673 h'—h 15 5 log 2:9567 
App.alt.84 6 59 App.alt. 4 56 44 
84 22 26 refr. ¢/=10! 5 11 49 
Reduc. zen. 309 Change refr. fork'—h = 20 
H' 84 23 1 5 11 29 refr. R = 8! 19" 
Refract. 5 Red, zen. 1 23 
84 22 56 par, «= | 5 12 52 
— Ref. 819 
r—-- = —4 eee ae 
P_R = + 46 42 5 4.33. pat. R=> 60 1 
P+x—-e—-R = 46 38 P—R = +46 42 
d= 9017 16 
3 = 89 30 38 
