518 Capt. Kater’s account of the re-measurement of 
micrometer microscope to determine the distance between the 
dots. 
Readings of the Micrometer. 
Distance between 
the Dots. 
Divisions. 
Divisions. 
IO 
314 
3°4 
14 
317-5 
S°3 5 
13 
3°3’5 
4>5 
309 
3°4’5 
84 
388 
3°4 
85 
3 8 9 
3°4 
9S 
3H 
3°4'5 
Mean 
3°4 
The value of one division of the micrometer was found by 
a number of trials to be ,00009758 of an inch ; the distance 
between the dots is therefore equal to ,0296582 of an inch. 
For a particular description of the cube, sphere, and cylin- 
der, I shall beg leave to refer the reader to Sir George 
Shuckburgh’s paper in the Philosophical Transactions for 
1798 ; and for the correction of some errors in computation, 
to a paper by J. Fletcher, Esq. given in the 4th vol. of 
Nicholson’s Journal, 8vo. 
The letters used in the following detail, indicate the same 
parts as in Sir George Shuckburgh's paper. The letters 
and lines made by Sir George Shuckburgh on the cube, 
sphere, and cylinder, in black lead pencil, still remained, and 
afforded the means of examining each step in succession. 
Great care v/as taken by leaving the apparatus together 
more than 24 hours, and by other precautions, to guard 
against errors whicli might arise from difference of tempe- 
rature ; and the same portions of Sir George Shuckburgh’s 
standard scale were used, as were employed by himself. 
