. Archives of useful knowledge. i-nish Wool, &c. 33COn the properties of Blued Steel, 346To prepare plates for engravers, 348Method of hardening steel, - 349On the collection of Saltpetre, 353 Siliclous productions of the U. S., S56Dveing qualities of Safflower, 360 Process for making Turnsol, Proportion of Acid in Sulphuric Acid of different densities, 363 Papers on Domestic and Rural Economy. On hanging GrindstonesOn preventing dampness in walls,To remove stains from Leather,On Spontaneous Combustion,New mode of Budding,To make Gooseberry Wine,Insuring houses from loss by fire. Papers on Jlg
. Archives of useful knowledge. i-nish Wool, &c. 33COn the properties of Blued Steel, 346To prepare plates for engravers, 348Method of hardening steel, - 349On the collection of Saltpetre, 353 Siliclous productions of the U. S., S56Dveing qualities of Safflower, 360 Process for making Turnsol, Proportion of Acid in Sulphuric Acid of different densities, 363 Papers on Domestic and Rural Economy. On hanging GrindstonesOn preventing dampness in walls,To remove stains from Leather,On Spontaneous Combustion,New mode of Budding,To make Gooseberry Wine,Insuring houses from loss by fire. Papers on the cultivation of Kohl Rabbi, Drum-head Cabbage, the cultivation of Madder, Liquorice Root,Frees and Plants suitable for culti-vation in the southern the Fullers Teazle,Calculation of the ground goneover in ploughing an on the Useful . of making Bricks,On Dyeing with fresh Madder ;72 381383387 389401 402 403407 362 Account of Nicholss Patent Press, 408. ARCHIVES OF USEFUL KNOWLEDGE. Vol. III. JULY, 1812. No. 1. PAPERS ON COMMERCE. New Method proposed for measuring- a Ship^s Rate of SaUmg-^By James Burney, Esq.^ A LINE towing astern of a vessel, which is passing throughthe water, will pull against her head-way. As the ships way in-creases, the pull of the line will increase ; and vice versa. If this,with a proper scope of line, (about 25 fathoms may probably besufficient), shall be found to be a regulated quantity of pull cor-responding in the same manner at ail times to the rate of sailing^it will answer the purpose of a log. Many experiments havebeen made upon the same principle j but the most plain and easyone, of towing a measured length of line, has escaped trial ;though less liable to give erroneous or variable results than anywhich can be made near a ship. By it, the rate of sailing may beobtained either constantly or occasionally, and can be taken withease by one person: in which respect it would ha
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