usual interest. ‘‘The Sewerage Problem propelling trolley is employed, running along at a line. The brake is used when the trolley is running on speed corresponding with that of the vehicle to which of the City of Worcester” describes a most important a steep incline of the wire. The carriage is… … clusion of a valua- trolley-wheels. ble article by the Tension on the cable inereases the resistance and consequently the It is provided with a pole which carries at its ex- late Capt. Cornelius W. McKay. ‘Tooth Powders” slips. The trolley-motor is provided with an electro- gives the method of…
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