Brinton, Willard Cope, 1880- · New York, The Engineering magazine company · leaf 75
58 GRAPHIC METHODS … ■■ Idle W^ Towing Carfloat ^^ towns lighter ^g running ught HBtaking Water ^^Coauns Fig. 60. Operations of Three Tug-boats in New York for Twenty-four Hours. The Boat Represented by the Lower Bar is in Service for a Twelve-Hour Shift Only A working chart of this kind would usually be made on a long…
Graphic methods · Statistics
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