The mechanical handling of material; being a treatise on the handling of material such as coal, ore, timber, &c. by automatic or semi-automatic ... of such plant, also dealing fully wit

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ... as not to project over the sides of the pontoon. The position of the shear legs when the elevator is housed is approximately at an angle of 35 degrees to the deck. To bring the elevator into action the main jib is hauled in, while at the same time the end of the jib moving in the slot in the side of the elevator trunk travels to the lowest point of the slot, with the result that the elevator is raised to a considerable height and rests in a vertical position in front of the shear legs. The pontoon is then brought with its bow against the side of the grain vessel. This is facilitated by the square nose of the pontoon. The elevator being sufficiently high above the bulwarks, will be over the hold when the pontoon touches the ship's side. It is then lowered into the hold of the vessel as shown in the illustration. The capacity is 150 tons per hour, and this can be kept up provided the trimmers can keel pace with it. This elevator is in use at the Victoria and Albert and also at Tilbury Docks. CHAPTER XIX. UNLOADING BY MEANS OF SPECIALLY CONSTRUCTED SELFEMPTYING BOATS AND BARGES. The methods of unloading barges described in the two previous chapters satisfactorily answer their respective purposes, but where quick delivery is essential, self-trimming barges and boats are employed. It might correctlv be said that appliances of this kind are as yet in their infancy. In fact, a number of costly self-trimmers were given up as useless before the appliances at present in use were constructed. Self-trimming barges are used for the purpose of transferring their contents, which may be grain, coal, &c, to other vessels, or to the receiving elevators or conveyors of granaries and coal stores. Paul's Self-trimming Barge.--One of the oldest self-trimmers, which is, howe...