Recent Inventions
RECENT INVENTIONS.
In the automatic apparatus for making altitude and temperature tracings in balloons sent above the heights in which ink would be frozen Professor Ossman has invented a pen which writes red with saltpeter ink on lamp-blacked paper.
A nickel in the slot X ray machine has been invented. The observer places a coin in the slot, moves a lever, puts his hand, or whatever he wishes to examine, into a box without any sides and looks down at it through a fluorescent screen which forms the top of the box.
The latest explosive shell has the greater part of its interior filled with lead, which, when fired, is melted by a burning composition, so that when the shell bursts the molten lead is scattered to a considerable distance, and the smallest particle causes a nasty wound.
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Ann Arbor Argus-Democrat