Page images
PDF
EPUB
[blocks in formation]
[merged small][ocr errors]

'n Account of an Experiment Made to betermine the Potential and Economic Vaporization of a Boiler
in the Establishment of Mr. Fremery, at Eupen. By Chief Engineer Isherwood, U. S. Navy

Progress of the Dephosphorization of Iron. By F. Gantier..

The Involute of the Circumference of a Circle. By L. D'Auria .......

New Pendulum Suspension. By Louis H. Spellier.........

Fie Puddling Process, Past and Present. By Percival Roberts, Jr...

[ocr errors][subsumed][merged small][subsumed][merged small][subsumed][subsumed][merged small]

Advantage of Metallic Lubricants, 21. Magnetic and Diamagnetic Elements, 33. American Laureates
of the French Academy, 44. Relation of Spectral Rays to the Constitution of Nebulæ, 56. Influ-
ence of Capillarity upon Dyeing, 59. Phosphorescence of the Glow-worm, 59. Variations of Gas-
eous Compressibility, 60. Measurement of High Pressures, 60. French Railways, 61. New Use
of Nickel, 61. The Longest Geodetic Arc, 61. Coal in India, 61. New Theory of the Formation
of Hail, 62. Relation of Gases to Pressure, Volume and Temperature, 62. Superficial Vibrations,
62. Newly-discovered Nei vous Energy, 63. Metallic Varnish, 63. Artificial Wines....................................

63

HOWSON & SON'S OFFICES

FOR PROCURING

nited States and Foreign Patents

AND PROSECUTING PATENT CAUSES.

HENRY HOWSON,

Engineer and Solicitor of Patents.

CHARLES HOWSON, Attorney-at-Law and Counsel in Patent Cases.

Principal Office, 119 South Fourth Street, Philadelphia. Branch Office, 605 Seventh St., Washington, D.C.

Authors of "The American Patent System," "Our Country's Debt to Patents," "Answers to Questions of the State Department Relating to Patents." Also, of a "Brief Treatise on Patents," published by Porter & Coates.

Jan. '80 1 yr.

RUDOLPH M. HUNTER, M.E., C.E.,

CONSULTING ENGINEER & SOLICITOR

-OF

United States & Foreign
PATENTS.

Expert in the Trial of Patent Causes.

Examinations in regard to the Validity and Infringement of Patents.

Offices,

Rejected Cases a Specialty.

901 Walnut St.,

Dec.. '79 Lyr

PHILADELPHIA.

[merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

Vol. LXXX.-JULY TO DECEMBER, 1880.

PHILADELPHIA:

FRANKLIN INSTITUTE, No. 15 SOUTH SEVENTH STREET.

1880.

« PreviousContinue »