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THOMAS A. SCOTT PROFESSOR OF MATHEMATICS IN THE UNIVERSITY OF PENNSYLVANIA.
E. S. CRAWLEY,
C8 Astrona hib
This collection of logarithmic tables has been prepared to accompany the editor's Elements of Trigonometry, in response to the demand of a number of teachers using the latter, who prefer a text bound with tables. In commending the tables to the use of educational institutions and the mathematical public in general, the editor wishes to state that great care has been taken to secure accuracy. The proof has been compared twice, number by number, with different standard tables (Vega's seven-place Tables, the 74th edition, edited by W. L. F. Fischer; and Gauss's five-place Tables, the 20th edition), and the method of differences was applied as a further check. Besides these, other tests were applied to parts of the tables, as in the case of Table III., where the log tan column was checked by taking the difference of log sin and log cos, and the log cot column was checked by taking the arithmetical complement of log tan.
Should any errors be discovered, the editor will be glad to be informed of them.
EDWIN S. CRAWLEY.
UNIVERSITY OF PENNSYLVANIA,