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"Watch and Clock Escapements A Complete Study in Theory and Practice of the Lever, Cylinder and Chronometer Escapements, Together with a Brief Account of the Origin and Evolution of the Escapement in Horology"

--Method of Examination.
Chapter X.--Presbyopia.
The Optician's Manual, Vol. I., is complete in itself, and has been the
entire optical education of many successful opticians. For student and
teacher it is the best treatise of its kind, being simple in style,
accurate in statement and comprehensive in its treatment of refractive
procedure and problems. It merits the place of honor beside Vol. II. in
every optical library.
Bound in Cloth--422 pages--colored plates and Illustrations.
Sent postpaid on receipt of $2.00 (8s. 4d.)
PUBLISHED BY THE KEYSTONE,
THE ORGAN OF THE JEWELRY AND OPTICAL TRADES,
19TH & BROWN STS., PHILADELPHIA, U.S.A.
* * * * *
THE OPTICIAN'S MANUAL
VOL. II.
BY C.H. BROWN, M.D.
Graduate University of Pennsylvania; Professor of Optics and Refraction;
formerly Physician in Philadelphia Hospital; Member of Philadelphia
County, Pennsylvania State and American Medical Societies.
[Illustration]
The Optician's Manual, Vol.


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