Dlffertations on Coins, Weights, &c. 31

I took a S. S. Shilling of King George the Firf^ whichweigh’d

gr-in Air - - - - 91.6

Water - - - - 83,0

Difference - — - 8.6Its specific Gravity 10.6511.

This exceeds the specific Gravity of our Standard uncoin’dSilver, which is only 10.535 ; but falls short of that ofKing William’* Half-crown , mention’d before, which amountsto 10.75. If there be no Mistake in DoBor Harris' s Num-bers or mine, the Half-Crown, by being letter'd upon theEdges, is more comprested and condensed in Proportion,than the Shilling.

I had some Suspicion that the Difference was, in somemeasure owing to the poor Relievo of King George's SilverMoney, tWe. therefore I took a Shilling os King Charlesthe Second with a bolder Relievo, and well preserved.

pw. gr. gr.

This weigh’d in Air - - - 3 . 20 — 92.000

Water - - - 3 - 11^83.373

Difference - - - 8.625

The specific Gravity 10.666, &fc.

Phis exceeds the specific Gravity of the former; but doesnot come up to that of King Williams Half-Crown.

CHAP.