ulian Byng's
army and a member of the British Military Mission to the United States,
has published a volume on "Gas and Flame in Modern Warfare" (George H.
Doran Co.).

CHAPTER XIII

See chapter in Cressy's "Discoveries and Inventions of Twentieth
Century." "Oxy-Acetylene Welders," Bulletin No. 11, Federal Board of
Vocational Education, Washington, June, 1918, gives practical directions
for welding. _Reactions_, a quarterly published by Goldschmidt Thermit
Company, N.Y., reports latest achievements of aluminothermics. Provost
Smith's "Chemistry in America" (Appleton) tells of the experiments of
Robert Hare and other pioneers. "Applications of Electrolysis in
Chemical Industry" by A.F. Hall (Longmans). For recent work on
artificial diamonds see _Scientific American Supplement_, Dec. 8, 1917,
and August 24, 1918. On acetylene see "A Storehouse of Sleeping Energy"
by J.M. Morehead in _Scientific American_, January 27, 1917.

CHAPTER XIV

Spring's "Non-Technical Talks on Iron and Steel" (Stokes) is a model of
popular science writing, clear, comprehensive and abundantly
illustrated. Tilden's "Chemical Discovery in the Twentieth Century" must
here again be referred to. The Encyclopedia Britannica is convenient for
reference on the various metals mentioned; see the article on "Lighting"
for the Welsbach burner. The annual "Mineral Resources of the United
States, Part I," contains articles on the newer metals by Frank W. Hess;
see "Tungsten" in the volume for 1914, also Bulletin No. 652, U.S.
Geological Survey, by same author. _Foote-Notes_, the house organ of the
Foote Mineral Company, Philadelphia, gives information on the rare
elements. Interesting advertising literature may be obtained from the
Titantium Alloy Manufacturing Company, Niagara Falls, N.Y.; Duriron
Castings Company, Dayton, O.; Buffalo Foundry and Machine Company,
Buffalo, N.Y., manufacturers of "Buflokast" acid-proof apparatus, and
similar concerns. The following additional references may be useful:
Stellite alloys in _Jour. Ind. & Eng. Chem._, v. 9, p. 974; Rossi's work
on titantium in same journal, Feb., 1918; Welsbach mantles in _Journal
Franklin Institute_, v. 14, p. 401, 585; pure alloys in _Trans. Amer.
Electro-Chemical Society_, v. 32, p. 269; molybdenum in _Engineering_,
1917, or _Scientific American Supplement_, Oct. 20, 1917; acid-resisting
iron in _Sc. Amer. Sup._, May 31, 1919; ferro-alloys in _Jour. Ind. &
Eng. Chem._, v. 10, p. 831; infl