The following article on using coins to estimate armor thickness originally appeared in Tactical and Technical Trends, No. 23, April 22, 1943. [DISCLAIMER: The following text is taken from the U.S. War Department publication Tactical and Technical Trends. As with all wartime intelligence information, data may be incomplete or inaccurate. No attempt has been made to update or correct the text. Any views or opinions expressed do not necessarily represent those of the website.]

COINS AS A MEASUREMENT OF ARMOR THICKNESS A convenient means of measuring armor thickness when no scale is available, is by comparison with a coin of known diameter. The following table may be of interest. The measurements are in terms of inches. U.S.      British      French 1 cent - 0.750 1/2 penny - 0.650 5 centimes - 0.630 5 cents - 0.835 1 penny - 0.984 10 centimes - 0.866 10 cents - 0.705 6 pence - 0.737 20 centimes - 0.945 25 cents - 0.955 1 shilling - 0.905 50 centimes - 0.669 50 cents - 1.205 2 shillings ("Florin") - 1.102 1 franc - 0.905 Silver dollar - 1.500 2 shil. 6 pence ("Half Crown") - 1.220 2 francs - 1.063

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