The age-herald., 1901-03-12
LIQUID AIR.
Lecture With Experiments at the lief
 ferson Friday Night.

In view of the progress which has been made in other fields of industry, the fu- ture uses of liquid air are incalculable.
 It's intense cold concentrated in small space. together with the fact that 1t Is absolutely dry, gives 1t an advantage over ice, especially valuable in refrigerating cars and on shipboard, or wherever econ- omy of space is important.
 Liuuid air must become valuable for automobiles, street cars aud all portable engines since no fuel with its necessary tender and no water and tank, and no ponderous boiler. need be carried. When steam is carried far from the boiler, as in steam drills, loss by condensation Is great; the farther liquid air Is carried the more it is expanded and the greater the force.
 Liquid air can be separated into its component gases, oxygen and nitrogen, by mechanical means without the use of heat or electricity. The oxygen so derived can be used in more than a hundred diff ferent industrial processes-to burn gar bage with the intensity of heat as great as the heat of coal; to completely con sume low-grade coals, burning even the smoke or soft coal and the odor of gar bage. By the use of little electric en- ergy ozone Is made the greatest purify ing agent known. Oxygen used in exple- siye engines does away with the smoke or odor by causing complete combustion of the gas.
 With the use of electricity, ammonia, nitric acid and sulphuric acid can be produced at a mere fraction of their pre- sent cost. More than two hundred indus trial uses for oxygen and nitrogen have been discovered. To the service of the governments of the world liquid air brings Q mission for both peace and war; in the navies it will work a revolution which will be felt In the national treasuries. Millions of dollars are locked up in fixed ammunition, the greater portion of which Is practically useless until demand Is made for it by war; and blessed experi- ence shows that this demand comes but once in a generation. It Is known that the battleships of the nations cost mfl- lions of dollars each, and are made more costly in the fact that they are built with the necessity of having the fire and coal bunkers in the same hull in close prox- unity to these large and costly masses of fixed ammunition; each vessel is a floating mine, and this means initial money iu construction, costly care and constant danger.
 The time may not be far distant when no money need be locked up in fixed am- munition, and a vessel need be no longer floating mine.
 For Blasting. In such an important work as the building of canal or the excavation of a tunnel, where cheap and safe explosives of high power are re- quired, liquid air is destined to play an important part. It Is impossible to esti- mate the enormous economy in the con- struction of liquid air plants along the line of the projected Nicaragua canal from which the liquid oxygen could be readily supplied in proper vessels and transmitted to the required points in proper quantities. The product being abundant, waste by evaporation Is un' important.
 The whole subject of liquid air and It's probable economic uses will receive a two hours discussion, illustrated with two dozen marvellous experiments, at the Jef- ferson Theatre Friday night, by Prof Eugene c. Foster and assistants from Temple College. Philadelphia. Regular prices of admission will be charged.