to a distance, either forpurposes of power or heating, without regard to thedirect cost of fuel. Engineers and inventors have,therefore, given much study and made many experi-ments, to the end of making the best possible and mosteasily applied coverings for pipes and boilers, to savefuel and insure… … ering which can be readily put on and quickly removedand replaced by an ordinary workman, while it isadapted to every shape of steam surface and everybend and angle in a job of pipe-fitting. These coverings are made on the principle of employ-Sngtwo or more layers or sheets of felt, or other…
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