ATREATISE of the Nature and Arithmetic of
LOGARITHMѕ; Likewife
Another of the ELEMENTS of Plane and Spherical
TRIGONOMETRY; With
A PREFACE, shewing the Usefulness and Excel-
lency of this WORK.
By Doctor JOHN KEILL, F. R. S. and late
Professor of ASTRONOMY in Oxford.
The Whole Revised; where deficient, Supplied; where
loft, or corrupted, Restored. Also,
Many Faults committed by Dr.HARRIS, Mr.CASWELL,
Mr. HEYNEs, and other TRIGONOMETRICAL
WRITERS, are shewn, and in those Cafes where
They are mistaken, here are given Solutions Geome-
trically True.
An ample Account of which may be seen in the PREFACE
By SAMUEL CUN Ν.
The TWELFTH EDITION,
Carefully Revised and Corrected.
To which is subjoined an APPENDIX, containing the
Investigation of those Series omitted by the AUTHOR;
and the Difference between Dr. KEILL and Mr. CUNN
impartially examined and adjusted.
Printed for W. STRAHAN. JE F. and CRIVINGTON,
T. LONGMAN, B. LAW, T. CADELL, E. JOHNSTON,
G. ROBINSON, and R. BALDWIN.