S. Navy mask (obsolete), U.S. Navy mask (final type), U.S. Army
box respirator (used throughout the war), U.S.R.F.K. respirator,
U.S.A.T. respirator (an all-rubber mask), U.S.K.T. respirator (a sewed
fabric mask), and U.S. "Model 1919," ready for production when the
armistice was signed. In the middle row, left to right, are: British
veil (the original emergency mask used in April, 1915), British P.H.
helmet (the next emergency mask), British box respirator (standard
British army type), French M2 mask (original type), French Tissot
artillery mask, and French A.R.S. mask (latest type). In the front row:
the latest German mask, the Russian mask, Italian mask, British motor
corps mask, U.S. rear area emergency respirator, and U.S. Connell mask]
[Illustration: PUMPING MELTED WHITE PHOSPHORUS INTO HAND GRENADES
FILLED WITH WATER--EDGEWOOD ARSENAL]
[Illustration: FILLING SHELL WITH "MUSTARD GAS"
Empty shells are being placed on small trucks to be run into the filling
chamber. The large truck in the foreground contains loaded shell]
For smaller work thermit has two rivals, the oxy-acetylene torch and
electric welding.
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