The English florin, sometimes known as the double leopard, was an attempt in 1344 by Edward III to produce gold coinage suitable for use in Europe as well as in England. It was authorised on 27 January 1344, and struck from 108 grains (6.99829 grams; 9⁄40 troy ounce) of nominal pure ('fine') gold and had a value of six shillings (equivalent to 3⁄10 pound sterling). The continental florin, based o. DescriptionThe obverse of the coin shows the king enthroned beneath a canopy, with two at the sides; the legend is. .
Only three examples of the coin are known. Two were discovered together on the banks of the in 1857, and are now held by the . Another was discovered at an undisclosed location in the south of En. [pdf]
A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
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