OVERHEAD STEAM CRANES FOR DOOR PURPOSES. ber uprights by four wrought iron plate brackets strength ry roller path and brackets for the gear required to transmit the traveling motion which will shortly be referred t is firmly bolted at the extreme end of the girders nearest to thedock while the girders are planked over so as to form a store for coal and water. The crane and the whole of the substructure is designed for a working load of 3 tuns at the maximum radius of 21 feet from center of crane post to as has already been stated of precisely the same construc tion as those which have given satisfactory working results gines by suitable gear and shafts to the traveling wheels and warping drums or capstans are fitted on a countershaft on the inner side of each frame so that these warping drums can be driven independently of the traveling wheels. This tuns and subsequently for speed when each crane delivered 50 tuns per hour from the trucks into the steamer's hatch way. The arrangement we have described may be modified with EAM CRANES AT MIDDLESBROUGH DOCKS that case being transmitted through a square shaft with tum bler bearings. This construction is especially valuable for use on a jetty where vessels lay on each aide; to suit these conditions the gantry is made to span the whole width of the jetty and to travel over the ordinary lines of rails and road way. Another modification of the system consists in having the crane fixed on an ordinary overhead traveler gantry or it may be made to travel across the gantry ; in such a case the fixed staging may be constructed of square timber or of col It might at first sight appear that the road to carry these able crane of the usual type working the same loads at the same radius. Several of these cranes have been in success ful operation for some time past and a number more are Sumac. than 20000 tuns of which about two thirds are imported good sumac cannot be grown in this country but be cause until a few storm detracts ma te
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