with draughting, and the centre of effort of the sails. Also, weights and sizes of ropes; masting, rigging, and sails of steam vessels; with dimensions for jibs, mainsails, etc., relative to every class of vessels. Together with an appendix comprising the several inventions of self-reefing topsails of Capt. Cunningham, R.N., F.R.S., Capt. Dyer, and Captain Howe; and also views and plans of making flat sails, by Mr. Sadler