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February, 1922 Direct-Connected Motor Driven Air Compressors Ingersoll-Rand Class ““PRE’’ The efficient regulation of the air output by the 5-step Clearance Control is prob- ably the outstanding reason for the success of Class “‘PRE”’ direct-connected, electric motor-driven compressors. Efficient Operation at Full and Partial Loads. With this regulation the compressor auto- matically operates at any one of the five load points depending upon the demand for air. The compressor will deliver full, three-quarter, one-half, one-quarter or none of its capacity and the horsepower required is practically 1n proportion to the air output. Another feature of the 5-step Clearance Control is the Maximum Demand Stop which prevents the compressor being operated at any higher maximum load than is desired. This is extremely important if a maximum demand or service charge is included in your contract for electric current. We will be pleased to quote on the compressor direct-connected to unity or leading power factor synchronous motor with exciter and panel. Bulletin 3126. INGERSOLL-RAND COMPANY 11 Broadway New York Ingersoll MARINE:REVIEW STEAMSHIP ‘‘BOLINDA”’ Built by Ralph J. Chandler Shipbuilding Co., Wilmington, Cal. Caulked with Stratford Oakum Stratford Special No. 1 Marine Oakum Users say that it is the most econom- ical Oakum to be had at any price. The material cost of Oakum amounts to much less than the labor cost of caulking. Do not waste good labor on bad Oakum—be sure to specify ‘Stratford Special No. 1’’. Illustration below shows Stratfords Oakum being caulked into deck of ship by Little David Caulking Machine. NK vente hla Bl | Hl emir Ki TE 0. af d Oakum Co. =-“Rand | Sc Stratford Oakum Co 607-C Please mention MARINE Review when writing to Advertisers