The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 60
f numbers, is a progressive increase or decrease in each suc-cessive number by the same multiplier or divisor at each step, as 1, 2, 4, 8,16, etc., or 243, 81, 27, 9, etc. The common multiplier is called the ratio.Let a = first term, I = last term, r = ratio or constant multiplier, n =number of… … ~<Jln ~n V« lrn-l log a = log I — (n — .1) log r. rn . log r ..== - log r log Z — log a log ( ■ a) - log (s - 0 log I — log ai - 1 i — l■ s- I log [a + (r — l)s] — log a logrlogZ - logRr - (r - l)s] 0. + 1. Population of the United States. (A problem in geometrical progression.) Year.…
Mechanical engineering
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