Sent postpaid to any part of the world on receipt of $2.50 (10s. 5d.)

THE KEYSTONE (SOLE AGENT),
19TH AND BROWN STREETS, PHILADELPHIA, U.S.A.

* * * * *

THE ART OF ENGRAVING

[Illustration]

A Complete Treatise on the Engraver’s Art, with Special Reference to Letter and Monogram Engraving.  Specially Compiled as a Standard Text-Book for Students and a Reliable Reference Book for Engravers.

This work is the only thoroughly reliable and exhaustive treatise published on this important subject.  It is an ideal text-book, beginning with the rudiments and leading the student step by step to a complete and practical mastery of the art.  Back of the authorship is a long experience as a successful engraver, also a successful career as an instructor in engraving.  These qualifications ensure accuracy and reliability of matter, and such a course of instruction as is best for the learner and qualified engraver.

The most notable feature of the new treatise is the instructive character of the illustrations.  There are over 200 original illustrations by the author.  A very complete index facilitates reference to any required topic.

Bound in Silk Cloth—­208 Pages and 216 Illustrations.

Sent postpaid to any part of the world on receipt of price, $1.50 (6s. 3d.)

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

* * * * *

THE KEYSTONE PORTFOLIO OF MONOGRAMS

[Illustration:  C.B.R.]

[Illustration:  A.O.U.W]

[Illustration:  I.R.C.]

[Illustration:  G.H.I.]

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.