Extracts from Computation Rules and Logarithms With Tables of Other Useful Functions by Silas W. Holman, New York, New York: Macmillan 1913.
"It would probably be within safe limits to assert that one-half of the time expended in computations is wasted through the use of an excessive number of places of figures, and through failure to employ logarithms." (Holman, page vii)
"These rules should enable a computer to decide at the outset of his work, or at the successive stages of it, what number of places of significant figures he should retain in order to avoid waste of labor on the one hand or sacrifice of accuracy on the other." (Holman, page xi)