Dr. H. W. Jayne, Chairman ; Mr. Edwin Swift Balch, Ph.D., Dr. Persifor

Frazer, Mr. Louis E. Levy, Prof. Coleman Sellers, E.D., Committeel'on
Publications ;

with the Assistance of
Dr. Wm. H. Wabl, Secretary of the Institute.

VOL. CLIX.-Nos. 949-954.

(80th YEAR.)

JANUARY-JUNE, 1905

PHILADELPHIA :

Published by the Institute, at the Hall, 15 South Seventh Street.

1905

Vol. CLIX.-January-June, 1903.

INDEX.

Accidents on American Railways...

.401
Adiabatics, determination of exponents of. (Snook).

.199
AI eremeter for high potential currents.. (Snook)....

.191
Anderson, Cyrus N. The U. S. patent laws, historically considered......51

Babbitt, Z. B. The telegraphone....

17
Bacterial disposal of sewage. (Hill)....

I
Bi-focal lens, a solid invisible. (Borsch).

313
Blast furnace practice. (Uetling).

117
Blast furnace gases, utilization of.

..460
BOOK NOTICES....

143, 322, 402, 464
Borsch, J. L. A solid invisible bi-focal lens.

313
Bradbury, Robert H. Radium and radio-activity in general.

.225
Bronzes for steam uses, physical characteristics of. (Kneass).. ...65

Carnegie Institution work....

.215
Calcium carbide as an explosive..

.455
Car wheels, rolled steel. (Vauclain).

.81
Chemical evolution.....

.396
Clock actuated by radium.

.437
Coal, experiments with submerged.....

.50
Combustibles, the value of the flame of. (Mahler-Isherwood).

..31
Compound gas engine....

.422
CORRESPONDENCE:

Sellers-Bancroft. Correction in Wm. Sellers memorial sketch....464
The proposed combination of the Mass. Institute of Technology
and Harvard University...

.146
“Critical point,” the.....

.422
Devereux, Washington. The inspection of electric conduits with espe-
cial reference to fire protection...

.299
Diffraction gratings, replicas of. (Ives)...

.457
Division of tests established by the Dept. of Agriculture...

.16

Electric conduits, inspection of, &c. (Devereux).

dissipation of fogs...
furnace construction.
power transmission in France, long-distance..
smelting of iron ores.
furnace inventions..

.299
.454

100
142

.44
.462