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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"

, 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.


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