Imperial measurement system converted to the Metric system
The British-American measurement system or Imperial System converted to the Metric System. Some examples of lengt measurements 1 inch = 2,54 cm 1 cm = 0,3937 inch 1 mm = 0,03937 inch 6 pounder = 4,1 cwt = 35mm = 3,5cm 13 pounder = 9 cwt 18 pounder = 12,4 cwt = 3,5 inch = 8,8 cm = 88 mm 4 inch = 10,1cm 5,9 inch = 150 mm = 15 cm 6 inch = 152 mm = 15,2 cm = 26 cwt 8 inch = 200 mm = 20 cm 9,2 inch = 133 mm = 23,3 cm 11,8 inch = 300 mm = 30 cm 15 inch = 380 mm = 38 cm More units and convertions can be found on wikipedia.