G. Method of Computing the Ratio from the London Price of Silver.

Rule.—Divide the number 943 by the number of pence at which silver is quoted.

In Great Britain 1869 sovereigns are to be struck out of 40 pounds troy of gold, 11/12 fine; and one ounce would be coined into 1869/(40×12) sovereigns, or £3 17s. 10½d., or 934½d., 11/12 fine. The ounce of pure gold, therefore, is worth 934½d. × 12/11.

If an ounce of silver of British standard, 37/40 fine, is quoted at x pence, an ounce of pure silver would be worth x × 40/37 pence.

The ratio of the value of an ounce of pure gold to an ounce of pure silver would be, therefore,