chlorine gas 217

Germans starting a gas attack on the Russian lines 224

Filling the cannisters of gas masks with charcoal made
from fruit pits--Long Island City 225

The chlorpicrin plant at the Bdgewood Arsenal 234

Repairing the broken stern post of the _U.S.S. Northern
Pacific_, the biggest marine weld in the world 235

Making aloxite in the electric furnaces by fusing coke
and bauxite 240

A block of carborundum crystals 241

Making carborundum in the electric furnace 241

Types of gas mask used by America, the Allies and Germany
during the war 256

Pumping melted white phosphorus into hand grenades
filled with water--Edgewood Arsenal 257

Filling shell with "mustard gas" 257

Photomicrographs showing the structure of steel made by
Professor E.G. Mahin of Purdue University 272