The Slide Rule Simplified

The Slide Rule Simplified

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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. 1918 edition. Excerpt: ...4.833. Place 5 on the "C" scale, over 483 on the "D" scale and under 1 on the "C" scale read.967 on the "D" scale, which is the log of the number required. Be careful when making the division to get the correct position of the decimal point. Then place the runner to 967 on the log scale and over it on the "D" scale read the number 93. Then marking off one more place than the index of the log, in this case 1, as there are no places in the index, you get 9.3 as the number wanted. These answers are as close as you can get on a small slide rule. EXAMPLE. Find the 8th root of 32500? Answer, v3.65. Find the 6th power of 7.8? Answer, 225000. Find the 24th root of 11500? Answer, 1.476. j Find the 15th power of.55? Answer, .000126. Find the 6 root of.0098? Answer, .464. In the extraction of roots of numbers that are entirely decimal, express the negative decimal as though subtracted from 10, in other words express--1 as 9, or--2 as 8. Then when dividing by the required root increase the index of the log by adding to it a number of tens, which shall be one less than the number of the root. For instance, in the last question above, the log of.0098 is 7.99--10; before you divide by 6, you add 5 tens or 50 to the index and make it 57.99 and this divided by 6, gives the log of the number required, i. e., 9.666, the log of.464. If it had been the 10th power, you would have expressed 7.99 as 97.99 before dividip?. SINES, TANGENTS, ETC. Above the "A" scale and marked SIN is the scale of natural sines from which can also be easily derived the natural cosine. Both sines and cosine are to be used in connection with scale "A." The log sine or log cosine can be found by transferring the value of more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236531418
  • 9781236531414