Methods proposed for decreasing the consumption of timber, in the Navy, [electronic resource] : by means of prolonging the duration of our ships of war; with observations on fastening ships with iron knees: to which are added, some general remarks on the present timbered state of the kingdom; in a letter addressed to the Right Hon. John, Earl of Chatham, First Lord Commissioner of the Admiralty. Together with a letter addressed to the honorable commissioners of the Navy, on the way of keeping, seasoning, and converting timber, before it is used in ship-building. With observations on the sap of oak trees. By Tho. Nichols, purveyor of the Navy for Portsmouth dock-yard.