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The experiments above adverted to are detailed in the Philoso­phical Transactions for 1798; and though the greatest attention was bestowed on those parts of the inquiry relating to theweight of the solids, the method ofmeasuring them is not so fully detailed; Cap­tain Kater, therefore, was desirous of re-investigating the latter sub­ject 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.

Calculations of some Observations of the Solar Eclipse on the 7th of September, 1820