150 



effected ; so that in March 1821 the parts were fit for the perform- 

 ance of their natural functions. 



Calculations of some Observations of the Solar Eclipse on the 7th of 

 September, 1820. By Mr. Charles Rumker. Communicated by 

 Thomas Young, M.D. For. Sec. R.S. Read May 10, 1821 . [PA7. 

 Trans. 1821, p. 311.] 



These calculations are founded upon Burckhardt's lunar, and Car- 

 lini's solar tables, 



An Account of the Re-measurement of the Cube, Cylinder, and Sphere, 

 used by the late Sir George Shuckburgh Evelyn, in his Inquiries 

 respecting a Standard of Weights and Measures. By Captain Henry 

 Kater, F.R.S. Read June 7, 1821. [Phil. Trans. 1821, p. 316.] 



The experiments above adverted to are detailed in the Philoso- 

 phical Transactions for 1798 ; and though the greatest attention was 

 bestowed on those parts of the inquiry relating to the weight of the 

 solids, the method of measuring them is not so fully detailed ; Cap- 

 tain Kater, therefore, was desirous of re-investigating the latter sub- 

 ject before the Commissioners of Weights and Measures should make 

 their final report. 



The author then proceeds to describe the state of the apparatus ; 

 and the means which he adopted in effecting this measurement of 

 three sides of the cube gives for its content 124' 1969 inches. 



The length of the cylinder deduced from these means is =5 '99 60 

 inches. 



In measuring the sphere, a brass square was originally employed, 

 the side of which was a little longer than the diameter. The sphere 

 being properly placed and supported within the square, a micrometer 

 screw which passed through one of the sides of the square was brought 

 in contact with the diameter of the sphere, and the reading of the 

 micrometer head noted ; the sphere being then removed, a brass rule of 

 known length was put into its place, and the micrometer screw being 

 brought in contact with the end of the rule, the difference between 

 its length and the diameter of the sphere was obtained, from which 

 the latter was determined. Captain Kater details at length the repe- 

 tition of Sir George's measurements, where it appears that the ex- 

 cess of the diameter of the sphere above the length of the rule gives 

 0-0012281 inch. The author then proceeded to measure the brass 

 rule, the length of which was found equal to 6*0063609 inches ; and 

 the diameter of the sphere thence deduced gave 113'5264 inches for 

 its solid content. 



Captain Kater concludes this paper with a table, showing the data 

 furnished by Sir George Shuckburgh Evelyn's experiments and his own 

 measurements ; from which it appears that the weight of a cubic inch 

 of distilled water, in a vacuum of 62, = 252'888 grains of Sir George's 

 standard, or = 252'722 grains of the parliamentary standard. 



