AND INSTRUMENTS AT MUNICH. 517 
mate time; the second column contains the readings of the 
differential apparatus, taken at the moment of adjusting the 
circle ; and the third column gives the readings of the circle. 
The zero point of the circle did not coincide with the meridian, 
but was to the westward of that line, and formed with it an 
angle noted in the fourth column. The last column shows the 
absolute declination, corresponding to the scale division 40 of 
the differential apparatus, assuming the collimation in the abso- 
lute apparatus I. to be 18! 27'"6, and in apparatus II. to be 
2! 53"-4. The scale divisions of the differential apparatus have 
a value of 30". 
Time.| Diff. Inst. ircle. Zero point of |Decl. for Scale 3 
me nst Circle Gicle: Sere Apparatus 
1841, Sept. 7. 
3 
2 
14 47:04 | 16 52-19 
3 
16 51°58 
16 52° 6 
21 
21 
23 
14 48:00 | 16 52-13 
4 
[Mr. Lamont then details similar observations made “ with a 
25 lb. bar suspended as usual, and furnished after the manner of 
the English instruments with an object-glass, in the focus of 
which is a scale cut on glass, divided to minutes.” These observa- 
tions are given for the purpose of showing the superior accuracy 
of those with the smaller apparatus, which moreover were ob- 
tained with much less labour. ] 
4. The apparatus for absolute intensity is the one which 
