rsons desiring any patent issued from 1836 to
November 26, 1867, can be supplied with official copies at reasonable
cost, the price depending upon the extent of drawings and length of
specifications.

Any patent issued since November 27, 1867, at which time the Patent
Office commenced printing the drawings and specifications, may be had
by remitting to this office $1.

A copy of the claims of any patent issued since 1836 will be furnished
for $1.

When ordering copies, please to remit for the same as above, and state
name of patentee, title of invention, and date of patent.

A pamphlet, containing full directions for obtaining United States
patents sent free. A handsomely bound Reference Book, gilt edges,
contains 140 pages and many engravings and tables important to every
patentee and mechanic, and is a useful hand book of reference for
everybody. Price 25 cents, mailed free.

Address

MUNN & CO.,
Publishers SCIENTIFIC AMERICAN,
37 PARK ROW, NEW YORK.

_BRANCH OFFICE--Corner of F and 7th Streets,
Washington, D. C._

* * * * *

PRACTICAL DRAUGHTSMAN'S BOOK OF
INDUSTRIAL DESIGN
AND MACHINISTS' & ENGINEERS'
DRAWING COMPANION.

Forming a Complete Course of Mechanical, Engineering, and
Architectural Drawing. From the French of M. Armengaud the elder,
Professor of Design in Conservatoire of Arts and Industry, Paris, and
MM. Armengaud the younger, and Amoroux, Civil Engineers. Rewritten and
arranged with additional matter and plates, selections from and
examples of the most useful and generally employed mechanism of the
day. By William Johnson, Assoc. Inst. C. E. Illustrated by fifty folio
steel plates, and fifty wood cuts. A new edition, 4to....$10

Among the contents are: Linear Drawing, Definitions, and Problems.
Sweeps, Sections, and Mouldings, Elementary Gothic Forms, and
Rosettes. Ovals, Ellipses, Parabolas, and Volutes. Rules and Principal
Data. Study of Projections. Elementary Principles. Of Prisms and other
Solids. Rules and Practical Data. On coloring Sections, with
applications. Conventional Colors, Composition or Mixture of Colors.
Continuation of the Study of Projection--Use of Sections--details of
machinery. Simple applications--spindles, shafts, couplings, wooden
patterns. Method of constructing a wooden model or pattern of a
coupling. Elementary applications. Rules and Practical Data.

THE INTERSECTION AND DEVELOPMENT OF SURFACES, WITH APPLICATIONS.--The
In