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ssignredespavareintynmnesoeysamoteatontenyntn ssovotesinannncnsonnioeeunspmmcennonnate . ~ . The Sperry Revolution Indicator System provides. a direct reading indication of the revolutions per minute of a vessel’s pror allers, and the total number of revolutions logged. It has been perfected after many years of research and experience in the field _ _ under actual service conditions. Muchcreditisdueto : steamship operators for their valuable suggestions, many of which have been incorporated in this instrument. Ease of installation and maintenance has been given’ ae primary consideration and only four conductors are : , required between a transmitter and an indicator. Either 110 volt or 220 volt ship’s supply is required and a signal light may be readily connected for flashing revolutions in a remote location. oe , : We will appreciate the privilege of sending a new : | illustrated booklet describing this apparatus in detail. Rvbcioudaainoroone DARA NORONIS ENNIS MARINE REVIEW—March, 1931