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a4 5 seconds Push in knurled button for one ~ quarter minute to get average R.P. M. TWO SHAFT COUNTER Separate six-figure counter for Port and Starboard Shafts. AVERAGE COUNTER A six-figure counter giving aver- age of Port and Starboard Shafts. AVERAGE R.P.M. in 15 seconds An improvement in R.P.M. find- ers. Push in the knurled knob for 15 seconds instead of one-half minute as in other types. TWO HAND TELLTALE forward and backward Two hands record at a glance the actual performance of each shaft, forward or backward. No mental calculations needed. COUNTERS ALWAYS RECORD AHEAD The entire case measures 14 inches long, 714 inches wide, and 35% inches deep. Cummings 2 Shaft Telltale Averaging Counter for the Merchant Marine A unique and exclusive feature of this instrument is the R. P. M. attachment which is especially appreciated by the man at the throttle. This makes it possible to obtain accurately with one reading the average R. P. M. of the two shafts. To use this R. P. M. attachment the counter is set to zero by turning the top knob one revolution, which takes but three seconds. With all figures set to zero, press the lower knob for fifteen seconds, and the counter indicates the exact R. P. M. without any calculations whatsoever. As it is important to know the total revolutions for both directions, one way gears are built in the counter. When engines are backing the counter continues to add revolutions instead of substracting as the ordinary continuous rotary counter does. Since there are ten figures on the unit ring of the counter each representing one complete revolution of the main shaft, the connection outside of the case must be geared down to make one revolution to ten of the main shaft. Let us send you Complete Details and Prices CUMMINGS MACHINE WORKS 66 255 Atlantic Ave., Boston, Mass. MARINE REVIEW—April, 1928