# Instructions for the engineers' & mechanics' improved slide rule

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### Contents

 Section 1 1 Section 2 3 Section 3 34
 Section 4 36 Section 5 38

### Popular passages

Page 25 - To find the side of a square equal in area to any given superfices.
Page 8 - Inverse, teaches by having three numbers given to find a fourth, which shall have the same proportion to the second, as the first has to the third.
Page 7 - The Single Rule of Three Direct teaches, by having three numbers given, to find a fourth, that shall have the same proportion to the third, as the second has to the first. If more require more, the proportion is direct...
Page 47 - Two men carrying a burden of 200 pounds, hung on a pole, the ends of which rest on their shoulders ; how much of this load is borne by each man, the weight hanging 6 inches from the middle, and the whole length of the pole being 4 feet ? Ans.
Page 11 - To find the geometrical mean proportion between two numbers. Set one of the numbers upon C to the same number upon D ; and against the other number upon C is the mean number or side of an equal square upon D. Required the mean...
Page 25 - To find the side of the greatest square that can be inscribed in a circle of a given diameter. Divide the square of the given diameter by 2, and extract the square root of the quotient.
Page 25 - Divide trie square of the given diameter by 2, and extract tJie square root of the quotient. (Art. 581. Obs. 1.) 17. The diameter of a round table is 4 ft. ; what is the side of the greatest square table which can be made from it 1 631.
Page 45 - ... pendulum. Or, it may be observed by the beats of the pulse in the wrist, counting, on an average, about 70 to a minute for persons in moderate health, or 5-^ pulsations to a mile ; and, more or less according to circumstances.
Page 9 - There being three orders of levers, or three varieties wherein the weight, prop, or moving power, may be differently applied to the vectis, or inflexible bar, in order to effect mechanical operations in a convenient manner.
Page 12 - C is 30 on D. To cube any number, set the number upon C to 1 or 10 upon D ; and against the same number upon D is the cube number upon C. Required the cube of 4. Set 4 upon C to 1 or 10 upon D ; and against 4 upon D is 64 upon C. To extract the cube root of any number, invert the slide, and set the number upon B to 1 or 10 upon D ; and where two numbers of equal value coincide on the lines BD, is the root of...