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This portfolio contains 121 combination designs. These designs were
selected from the best of those submitted in a prize competition held by
The Keystone, and will be found of value to every one doing engraving.

The designs are conceded to be the best in the market, excelling in art
and novelty of combination and skill in execution.

They are printed from steel plates on stiff, durable paper, and contain
sample monograms in a variety of combinations.

The portfolio is a bench requirement that no jeweler can afford to be
without. It is a necessary supplement to any text-book on letter
engraving.

Price,
50 Cents (2s.)

PUBLISHED BY THE KEYSTONE,
THE ORGAN OF THE JEWELRY AND OPTICAL TRADES,
19TH & BROWN STS., PHILADELPHIA, U.S.A.

* * * * *

THE OPTICIAN'S MANUAL

VOL. I.

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.

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The Optician's Manual, Vol. I., has proved to be the most popular work
on practical refraction ever published. The knowledge it contains has
been more effective in building up the optical profession than any other
educational factor. A study of it is essential to an intelligent
appreciation of Vol. II., for it lays the foundation structure of all
optical knowledge, as the titles of its ten chapters show:

Chapter I.--Introductory Remarks.
Chapter II.--The Eye Anatomically.
Chapter III.--The Eye Optically; or, The Physiology of Vision.
Chapter IV.--Optics.
Chapter V.--Lenses.
Chapter VI.--Numbering of Lenses.
Chapter VII.--The Use and Value of Glasses.
Chapter VIII.--Outfit Required.
Chapter IX.--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 O