In which sport do the rules specify that the ball used must not weigh less than 45.93 grams and must have a diameter of at least 42.67 millimetres?
Golf ball Golf ball A golf ball is a special ball designed to be used in the game of golf. Under the rules of golf, a golf ball has a mass no more than 1.620 oz (45.93 grams), has a diameter not less than 1.680 in (42.67 mm), and performs within specified velocity, distance, and symmetry limits. Like golf clubs, golf balls are subject to testing and approval by the R&A (formerly part of the Royal and Ancient Golf Club of St Andrews) and the United States Golf Association, and those that do not conform with regulations may not be used in
History of the British farthing inscription . In 1806–1807 a further 22.5 tons of copper was struck into farthings by Boulton, but the price of copper had risen again and the weight was less than the 1799 issue. Farthings of the 1799 issue weigh 5.8–6.6 grams, with a diameter 23–24 millimetres, while the later Boulton issue weighs 4.7–4.8 grams with a diameter 21–22 millimetres. For the 1806–1807 issues, the denomination was removed from the coin, was abbreviated as , and the image of Britannia was slightly modified. Copper farthings and halfpennies from before 1797 were called in by proclamation dated 5 December 1817, and were