Transactions of the Society, Instituted at London, for the Encouragement of Arts, Manufactures, and Commerce (Volume 23)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1805. Excerpt: ... It may hot be ahiiss to mention mode of calculation when the circumference is taken in inches, instead of the tine-fourth girt to which the tables and slide-rules in use are adapted, viz. Square the girt, or multiply it by itself; multiply this by the feet In length, and divide the product by 2304, the quotient is the content: thiis, in the first tree in the 20th class (l6'xl6x2S)-s2304=2, with 1280 remaining, and (1280 multiplied by 12)-r2304=7; the contents therefore is 2-rV feet. The remaining business was dbne by Smith and my brother, Benjamin Farey in my office at Woburn. The original book was first carefully looked over, and all the figures which had ft. against them were circled round with a pericil, to distinguish them; so were the spruce, ----- ' Because the girt is four times too much before squaring, and !, ! square inches make a foot, therefore 4XX 144=2304 is the divisor for reducing to the customary or round nieasurc. Sec a paper on this subject in Tilloch's PAit. Mag. No. 75, vol. xix. page 213. i pine, latch, &c. A paper was then ruled into upright columns, about a quarter of an inch wide, and on the top, tileclasses 5th, 6th, 7th, 8th, &c. were AVritten; a person then read over the girt of the Scotch firs, while another marked with a pencil each time under the proper class; in this way they proceeded till a page of the original book Avus got through or till they had come to the end of one of the five divisions of the wood; the number of marks under each class were then counted, and set down under each other regularly; in like manner the small Scotch firs of, 2, 3, 4, &c. feet high were separately collected and set down under the proper classes. The trees of other kinds in that page were then collected into classes, and the small o...