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Lancaster R.TF 1870

510.8

1 G

HARVARD ENGINEERING LIBRARY

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TREATISE

ON

MATHEMATICAL INSTRUMENTS:

EIGHTH EDITION,

THEIR

CONSTRUCTION, ADJUSTMENT, TESTING, AND USE

CONCISELY EXPLAINED.

BY J. F. HEATHER, M.A.

9

OF THE ROYAL MILITARY ACADEMY, WOOLWICH, AUTHOR OF "DESCRIPTIVE

GEOMETRY."

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LONDON:

VIRTUE BROTHERS & CO., 26, IVY LANE,

PATERNOSTER ROW.

1866.

HARVARD COLLEGE LIBRARY
TRANSYLARED FOR THE

ENGINEERING SO COL
1941

PREFACE TO THE EIGHTH EDITION.

AN attempt has been made in the following pages to put within the reach of all a short and compendious treatise upon some of the ingenious instruments by which the scientific practitioner is aided in his observations, and in the delineation of the results obtained from them.

The instruments treated of have been divided into five classes, to each of which a part of the work has been devoted. The first part treats of Mathematical Drawing Instruments; the second, of Optical Instruments; the third, of Surveying Instruments; the fourth, of Astronomical Instruments, and the fifth, and last, of Goniometrical Instruments, for measuring the angles of crystals.

The greater part of the Wood Engravings, and some parts of the Text, of "Simms's Mathematical Drawing Instruments," have been pressed into the service of the present work; and the works of the best writers upon the several parts of the subject have been consulted, and much valuable matter has been extracted from them, particularly from Pearson's "Astronomy."

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