lete, fresh air being furnished in such quantities that CT “IMPROVED METHOD OF STRINGING PIANOS. ; the air is changed every ten minutes and can be The improved method of stringing pianos, which has boilers of 80 horse power each’ furnish heat to the been. used exclusively by the Mason .& Hamlin… … course in engineering, and as for techical education, pany for a number of years, is a great advance on the the plant will enable it to compete with the Pratt, method formerly employed. The system is clearly Drexel and Armour Institutes. THE McCONNELL FILTER. shown in the accompanying cut. It…
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