Category: Engineering & Technology
Several new slide rules for special calculations are described in this edition, and the contents further extended to include a section dealing with screw-cutting gear calculations by the slide rule—an application of the instrument to which attention has been given recently.
Several new slide rules for special calculations are described in this edition, and the contents further extended to include a section dealing with screw-cutting gear calculatio...
2. Part 2With the C or D scale, it will be noticed that the length of the interval 1–2 is sufficient to allow each of the 10 subdivisions to be again divided into 10 parts, so that the w...
3. Part 3GENERAL RULE FOR NUMBER OF DIGITS IN A QUOTIENT.—_When the first significant figure in the_ DIVISOR _is greater than that in the_ DIVIDEND_, the number of digits in the quotient...
4. Part 4TABLE OF CONVERSION FACTORS. ─────────────────────────────────────────────────────────────── GEOMETRICAL EQUIVALENTS. ──────────────────────────┬──────────────────────────┬─────...
5. Part 5Pointing the number off in the manner described, it is seen that there are _two_ figures in the first section—viz., 14. Setting the cursor to 14 on the R.H. scale of A, the slid...
6. Part 6Special graduations, marking the position of constant factors which frequently enter into engineering calculations, are found on most slide rules. Usually the values of π = 3·14...
7. Part 7To find the cylinder ratio in compound engines, invert the slide and set index of Ɔ to diameter of the low-pressure cylinder on D. Then over the diameter of the high-pressure cy...
8. Part 8Owing to the rapidly diminishing differences of the values of the sines as the upper end of the scale is approached, the sines of angles between 60° and 90° cannot be accurately...
9. Part 9With the slide set as above, the 8th, 9th, etc., powers of 1·1 cannot be read off; but it is seen that, according to (2) in the foregoing, the missing portion of the E scale is...
10. Part 10The maximum number of figures in the quotient is the difference between the sum of the number of figures in the numerator factors and those of the denominator factors, _plus_ 1...
11. Part 11THE BAINES SLIDE RULE.—In this rule, invented by Mr. H. M. Baines, Lahore, four slides carrying scales are arranged to move, each in edge contact with the next. The slides are k...
12. Part 12THE DAVIS-GRINSTED COMPLEX CALCULATOR.—This slide rule is of considerable service in connection with calculations involving the conversion of complex quantities from the form _a...
13. Part 13───────────────────────────────────────────────────────────────────────── EQUIVALENTS OF POUNDS AVOIRDUPOIS. ─┬───────┬────────────┬────────────────┬────────────────┬───────────...