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480 LOOKING INTERIOR OF MACHINERY HOUSE TOWARD THE OPERATOR'S CAB to support the jib, counterweight, ma- _chinery, electrical equipment and operator's house. A steel ladder is 'provided on the jib to provide access to the sheaves and other parts. The counterweight is made of con- crete blocks in such shapes and sizes that they can be readily handled in case it is desired to dismantle the crane. The cab is composed of a steel framework covered with sheet steel. It contairis the main part of the hoisting, lufing and rotating mechanisms. The control of all motions is so located that the operator has an unobstructed view of the load at all times. The hoisting and chanism includes a winding drum, driven through a jaw clutch and a train of spur gearing by a motor equipped with a solenoid brake, and necessary control aparatus and mis- cellaneous parts. Boom Luffed by Worm Drive The luffing of the boom is accom- plished by a worm-driven drum operated by the _ hoisting motor through a jaw clutch and gearing so arranged that the boom can be raised or lowered at the convenience of the operator. The pitch of the worm is such that no. mechanical brakes are re- quired to prevent the load from low- ering. but, as an additional safety, a pawl is provided to lock the luffing drum in any desired position. The slewing is accomplished by means of a motor operated through a train of spur and bevel gearing and a pinion meshing with the master gear attached to the semiportal bridge. A powerful foot brake is provided on motors, lowering me-' THE MARINE REVIEW this mechanism, having a latch by means of which the brake can be locked for any desired fixed position of the revolving superstructure. A motor for traveling the bridge is mounted on one of the girders of the semiportal bridge. This motor is connected to the driven track wheels through spur and bevel gearing and line shafting. One truck on the wharf rail is driven and one wheel on the shed rail. A solenoid brake is mounted 'on the armature shaft extension. Con- trol apparatus for traveling is located in the operator's house. Electrical connections between the conductors on the semiportal bridge and on the revolving superstructure are made through collector rings mounted on the center pivot pin or an extension. In' addition to the solenoid brake, hand operated rail clamps are pro- vided which clamp the wharf rail to hold the bridge in any fixed position. The winding drum for the hoisting mechanism is cast iron with turned grooves to fit the rope. The electrical equipment is designed for a direct current of 230 volts. The controllers and magnetic brakes are General Electric Co. type. The motors are of the following horsepower: Main hoist and luffing, 65; slewing, 15; bridge travel, 24. The controller for the hoist and lufing motor is of the reversing magnetic switch, dynamic braking type, consisting of a control panel, heavy duty cast grid resistor and a vertical handle master controller. Has Safety Switch In connection with the clutch shift- ing lever which engages the hoist and lufing gearings with the driving motor, an interlocking, mechanically operated switch is provided. When the clutch shifting lever is in central or neutral position, with both clutches disengaged, this switch prevents the operation of the motor. In _ other words, the function of this switch is to prevent the starting of the hoist motor without any load. The slewing motor is controlled by a magnetic switch reversing plugging controller, consisting of a control panel, heavy duty, cast grid resistor and a vertical handle master con- troller. The plugging feature in- corporated allows the motor to be reversed from full speed in one direc- tion to full speed in the opposite direc- tion without exerting over approxi- mately 180° per cent full load torque. The bridge motor control is of the magnetic switch reversing type with shunted armature points and consists of a control panel, heavy duty, cast grid resistor and a- vertical handle master controller. The ~ armature October, 1919 INTERIOR OF OPERATOR'S CAB SHOWING AR- RANGEMENT OF CONTROL LEVERS shunting points speeds and also permit accurate con- trol in case a favorable wind may help the motor in traveling, which would ordinarily give an ~ excessive speed. All controllers are equipped with series relays for accelerating the motors. Ample provision is made for the protection of workmen. Guards ex- tending down close to the rails and forming part- are, placed qn front of track 'wheels. All gears are enclosed. Ladders and platforms are mechanical parts of the crane which are subject to inspection and repairs. Hand railings are provided around all platforms. Sheaves are provided with tight fitting guards where necessary. A limit switch is provided to prevent over travel in the hoisting direction on the main hoist motion.. A pressed steel foot gong is provided in the operator's cab for signaling purposes. There is a mechanical gong on the bridge motion. This gong will ring continuously. Roller bearings are used throughout the crane for the different motor driven units. Safety Council Meets The National Safety council hold its eighth annual safety con- gress in Cleveland, Oct. 1-4. Among the problems for discussion are labor unrest, increasing plant efficiency and production, decreasing manufacturing costs and other subjects pertaining to labor management. Four general ses- sions have been arranged, which will be devoted to marine and navigation problems. allow slow bridge: of the truck brackets. provided for access to: will: one of