Salt (Sodium Chloride):--Freezing Temperature Chart--Heating Concrete
Materials; Portable Heaters; Heating in Stationary Bins; Other Examples
of Heating Methods, Power Plant, Billings, Mont., Wachusett Dam,
Huronian Power Co. Dam, Arch Bridge, Piano, Ill., Chicago, Burlington &
Quincy R. R. Work, Heating in Water Tank--Covering and Housing the Work;
Method of Housing in Dam, Chaudiere Falls, Quebec; Method of Housing in
Building Work.