John Howard Cromwell

“ Screw-Cutting Tables, for the use of Mechanical Engineers, showing the proper arrangement of wheels for cutting the threads of screws of any required pitch, with a table for making the Universal Gas Pipe Threads and Taps. ”

“ Positive and negative quantities. Multiplication, involution, exponents, negative exponents, roots, and the use of exponents as logarithms. Logarithms. Tables of logarithms and proportional parts. Transportation of systems of logarithms. Common uses of common logarithms. Compound multiplication and the binomial theorem. Division, fractions and ratio. Rules for division. Rules for fractions. Continued proportion, the series and the summation of the series. Examples. Geometrical means. Limit of series. ”

“ Spons'.—Tables and memoranda for engineers, by Hurst. The vest pocket edition, 64mo., roan, 50c.
Mackesy.—Tables of barometrical heights to 20,000 feet, specially adapted for the use of officers on service, civil engineers and travellers. With 3 diagrams, 32mo., cloth, $1.25.
Bayley.—Pocket-book for chemists, chemical manufacturers, metallurgists, dyers, distillers, brewers, sugar refiners, photographers, students, etc., etc. 32mo., roan, $2.00. In the press.
Books mailed post paid to any address in the world on receipt of price. ”