The entire history of the liquefaction of gases from the earliest times of
achievement to the present day-the biography of the great in-
vestigators the manipulation of liquid air and liquefied gases
-experiments with the same the modern uses of lique-
faction processes and of their products-the utiliza-
tion of the nitrogen and oxygen of the air, the
rare gases, helium, argon, and neon, and their
utilization, and the latest developments
in this field of industrial science,
are also treated.
T. O'CONOR SLOANE, Ph.D.
Author of "Arithmetic of Electricity," "Electricity Simplified,” Etc.
THE NORMAN W. HENLEY PUBLISHING CO.
2 West 45th Street