Show FEATHERY 1 WOOL r MADE ADE OF SLAG For many years travelers in the Salt Lake v valley have shaken their heads at the sight of mountains o of f slag from the smelters and wondered if the stuff couldn't be used Now of all things it is used t to o stuff your furniture to make it soft Processed by a new method the slag can can be made into rock wool which is a new Insulating material the use of which is steadily grow grow- growIng growing ing among builders and furniture makers One ton of slag will produce three-fourths three of a ton of rock wool |