...The practical application of this process of reasoning was enormouslyfacilitated by the invention of logarithms by Napier... 
George Forbes 「History of Astronomy」
...Contains the following Tables:—Seven Figure Logarithms (1-100,000);Logarithmic Sines, Tangents and Secants; Natural Sines, Cosines, VersedSines, Chords, etc...
Joseph Lievesley Beeston 「Five Months at Anzac」
...The invention of logarithms, by Baron Napier, of Merchistoun, was foundto be of inestimable value to astronomers in facilitating andabbreviating the methods of astronomical calculation...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...By the use of logarithms, arithmetical computations which necessitatedlaborious application for several months could with ease be completed inas many days...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...The computation can be very greatly abridged by the useof logarithms...
George C. Comstock 「A Text-Book of Astronomy」
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