. Porti e terminal. Orecrane sono stati ordinati. I produttori di gru dichiarano per iscritto di essere disposti a garantire risultati equivalenti a qualsiasi gru portuale. Queste cifre, basate sui test ufficiali di accettazione delle autorità portuali, forniscono dati relativi al tempo reale di trasferimento e all'effettivo 1 H. MCL. Harding, Journal of Commerce, 30 giugno 1917. Vedere anche otherarticles in International Marine Engineering, Freight Handling, etc CARGO TRANSFER AND HANDLING 157 output per hour; capacità delle gru, 5,000 chilogrammi, o 11,025libbre; velocità di hting per minuto, 24 metri

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. Ports and terminal facilities . orecranes were ordered. The crane manufacturers state in writing that they are willing toguarantee equivalent results by any of their harbor cranes. These figures, based upon the official acceptance tests of the portauthorities, give data as to actual time of transference and the actual 1 H. McL. Harding, Journal of Commerce, June 30, 1917. See also otherarticles in International Marine Engineering, Freight Handling, etc. CARGO TRANSFER AND HANDLING 157 output per hour; capacity of the cranes, 5, 000 kilograms, or 11, 025pounds; hfting speed per minute, 24 meters, or 79 feet per minute;revolving IH times per minute equal to 130 feet at the hook. The current consumption is figured for a cycle consisting of thefollowing movements; lifting 11, 025 pounds out of the vessel 25.5 feethigh, revolving the crane through 120 degrees, lowering the load to thewharf, lifting the empty hook, revolving the crane through 120 degreesback to its original position and lowering the hook to the position from. Fig. 50.—Seiiii-portal gantry crane, with car tracks set flush. which it was started. This was repeated a number of times in order toget the average time per cycle. The time for one cycle was 70 seconds, to which 20 seconds havebeen added for attaching and detaching the load, therefore the cranemade 40 cycles per hour, making an output of 2205 5 X 540 X 2000 220 tons of 2, 000 lbs. From the above figures, made under the favorable conditions of atest, it will be seen that 220 tons are possible per crane, and with avessel with five overall hatches it is possible to operate two cranes ateach hatch, which means that ten cranes can be working at one time;which would give 2, 200 tons of 2, 000 pounds per hour. There are similar records from most European ports extending overmonths and years of practical operation. 158 PORTS AND TERMINALS Making all due allowances, raising only one consignment, mark orcross mark per draft of merchandise with two-ton or three-

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• bookcentury1900
• bookdecade1910
• booksubjectharbors
• booksubjectr