. Railway mechanical engineer . TWIN SCREW DRILL CHUCK In the photographs are shown a twin screw drill chuckwhich has recently been placed on the market by the Marvin& Casler Company, Canastota, N. Y. The special featuresof this device are the twin screw clamping arrangement, andthe rugged character of the construction throughout, the pur-. The Casler Twin Screw Drill Chuck pose being to provide for gripping the drill so lirmly that itmay be crowded to the limit of its strength. Referring to the two views of the partially dissembledchuck it will be observed that the primary screw E is threaded

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering