A Treatise On a Box of Instruments And the Slide Rule for the Use of Gaugers
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To quickly assess the difficulty of the text, read a short excerpt:
For the succeeding trapezoid, add together ab, cd, and multiply by bd ; and go proceed. Then, as, in all these cases, this gives double INSTRUMENTS AND THE SLIDE-RULE. 179 the area, add the whole together, halve the sum, and di- vide by the number of links in an acre, viz. 100, 000, (that is, point off the 5 right-hand figures, ) and the content is in acres and decimal parts; the latter of which being multiplied by 4 and 40, (which need not be set down, ) gives the roods and poles. In taking th...e distances from the field-book, the numbers up the middle column, 92, 208, &c. , have to be subtracted from each succeeding, and the offsets, 0, 32, 36, &c. , to be added together in pairs. The work will stand thus : 180 92 116 176 136 210684 208 32 68 36 33 2944 7888 388 194 928 1056 408 6336 543 276 696 528 408 4488 1164 2944 7888 . 6336 4488 2)232340 1652 1940 1. 16170 210684 25. 8720 Content, 1 acre 25 poles.
180 A TREATISE ON A BOX Off TRIGONOMETRY AND NAVIGATION.
THE trigonometrical slide is a slide containing the loga- rithmic sines and tangents, the former of which work to the line D, and the latter to the line A, which lines, as before explained, are also logarithmic.
What to read after A Treatise On a Box of Instruments And the Slide Rule for the Use of Gaugers?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Kentish to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
For the succeeding trapezoid, add together ab, cd, and multiply by bd ; and go proceed. Then, as, in all these cases, this gives double INSTRUMENTS AND THE SLIDE-RULE. 179 the area, add the whole together, halve the sum, and di- vide by the number of links in an acre, viz. 100, 000, (that is, point off the 5 right-hand figures, ) and the content is in acres and decimal parts; the latter of which being multiplied by 4 and 40, (which need not be set down, ) gives the roods and poles. In taking th...e distances from the field-book, the numbers up the middle column, 92, 208, &c. , have to be subtracted from each succeeding, and the offsets, 0, 32, 36, &c. , to be added together in pairs. The work will stand thus : 180 92 116 176 136 210684 208 32 68 36 33 2944 7888 388 194 928 1056 408 6336 543 276 696 528 408 4488 1164 2944 7888 . 6336 4488 2)232340 1652 1940 1. 16170 210684 25. 8720 Content, 1 acre 25 poles.
180 A TREATISE ON A BOX Off TRIGONOMETRY AND NAVIGATION.
THE trigonometrical slide is a slide containing the loga- rithmic sines and tangents, the former of which work to the line D, and the latter to the line A, which lines, as before explained, are also logarithmic.
What to read after A Treatise On a Box of Instruments And the Slide Rule for the Use of Gaugers?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Kentish to read onlineMoreLess
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