Statistics for occurrence #1 of “Mr. Perring” in chapter 8 of H. Wager Halleck , A. M. , Lieut. of Engineers, U. S. Army ., Elements of Military Art and Science; or, Course of Instruction in Strategy, Fortification, Tactis of Battles &c., Embracing the Duties of Staff, Infantry, Cavalry, Artillery and Engineers. Adapted to the Use of Volunteers and Militia.:

...ingly. The average durability of ships of war in the British navy, has been variously stated at seven and eight years in time of war, and from ten to twelve and fourteen years in time of peace. Mr. Perring , in his Brief Inquiry, published in 1812, estimates the average durability at about eight years. His calculations seem based upon authentic information. A distinguished English writer has more rec...
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