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ITEMS.

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. Intlu-
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 Are, 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-liscovered Nei vous Energy, 63. Metallic Varnish, 63. Artificial Wines.com.b ...............

Philadelphia: FRANKLIN INSTITUTE, 15 South Seventh St.

[blocks in formation]

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 l yr.

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

CONSULTING ENGINEER & SOLICITOR

-OF

United States & Foreign
PATENTS.

Expert in the Trial of Patent Causes.

cixaminations in regard to the Validity and Infringement of Patents.

Rejected Cases a Specialty. Offices, 901 Walnut St.,

PHILADELPHIA.

Doc., 979 tyr

THE

JOURNAL

OF THE

FRANKLIN INSTITUTE

DEVOTED TO

SCIENCE AND THE MECHANIC ARTS,

PUBLISHED BY

THE INSTITUTE,

Under the Direction of the Committee on Publication.

Vol. OX.-Nos. 655-660.

THIRD SERIES.

Vol. LXXX.—JULY TO DECEMBER, 1880.

PHILADELPHIA:

FRANKLIN INSTITUTE, No. 15 SOUTH SEVENTH STREET.

1880.

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