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M ARR 1 ON Ue which the materials are brought to the platforms. The gradient of this structure is 1:4, 5. In addition to this flying stages can be put up from which riveting of the butts of the vessels' shell-plating can be performed. Numerous stairs connect all the working platforms with each other and with the ground and the gangways placed beside the crane girders on their bracing. The foundations for the columns consist of concrete blocks placed on wooden piling, which are protected 186% A 132.21 B 128.16' R & Vv @& & © 41 ft. and the other 68 ft. wide; the height of the side wall is 80 ft. The appliances for handling material consist, firstly, of a wire ropeway, the trolley of which is actuated by electricity, the traversing and lifting being effected by two winding drums which are placed in the power house. Light railway lines are laid down, by which the building material can be brought - alongside the _-- ship 'under construction. Over each slip two parallel runways are < provided, each to re- ceive a 3-ton electric &B1 at the water end by traveler of special de- 1 N rH ry TSCA ZS TAS AIZISI ESTES 4b ISIS) ) Li VI) a continuous line of pale-planking. The riveting of the sign. They have, as can be seen in our structure was machine illustration, a _ hori- tere zontal swivelling arm 82-87 3828" _§2'8 7 made. This necessi- tated, as far as possi- ble, all the work being done in the shops so as to reduce the rivet- ing at the site to a minimum. The extremely nar- row site required a very careful and diffi- cult mode of erection. The slips were erected without any scaffold- ing by means of a gigantic gantry crane having a clear height of 134 it.;5 in. and a clear width of i178 ft. 'This crane traveled on a double track which was laid on a special piling. The crane lifted the completely riveted outer and middle columns and cross girders which were then bolted down to their respective supports. 'The uprights between the main columns were fixed to the working platform by workmen who had taken up their places in a specially provided cradle which was lifted by the crane. The two smaller slips were lifted by a jib crane placed on a special tres- tle. The erec- tion of the main structure, in- cluding cranes, took g months. The weight of the whole steel structural work was 3,600 tons. As will be seen from our illustrations the slips were left entirely open, no glazing in of the roof or sides being applied. As reason for this it was said that a roofing materially interferes with the light and creates draughts. Even if glass were chosen for the roofing material the dirt collecting would restrict the passage of the light. It was moreover considered that the noise made by the men at work on a vessel under a. roofed building slip would be unbearable and, last but by no means least, a glass roof would have considerably raised the first cost and the maintenance. Another instance of such steel building slips are represented by the diagram in Fig. 4. These are the berths at the yard of Messrs. Swan & Hunter at Wallsend-on- Tyne, England. They are 500 ft. long, one being 72 EES SS BUILDING SLIPS AT MESSRS. WM. BEARDMORE'S YARD AT DAIMUIR, SCOTLAND. ce which can be revolved Se and traversed at the same time, thus ena- bling them to serve ° the whole area of the berth and to reach the center line of the ship, which is a con- venient arrangement, seeing that many parts put on board have to be placed at the center line. The speed of lifting is 100 ft. per minute and the traverse speed is 300 ft. per minute. A hydraulic passenger lift is provided to carry from eight to ten men to the upper deck of the vessel under construction. A special feature .of this structure is the provision of a track on the top of.the eastern slip for a traveling cantilever crane which 'serves another berth on the principle of the Brown Hoisting 'Machinery Co. The experience made with these covered slips compared with the un- covered ones may be shortly summed up as follows: The tempera- ture is higher in winter and lower in sum- met than out-- side... Lhere iis no complaint from the men on the score of .drau ets; though the slips MARINE REVIEW BUILDING BERTHS AT MESSRS. SWAN & HUNTER'S YARD AT WALLSEND-ON-TYNE, ENGLAND. are open at both ends. The glass roof is an obstruction to 'light to a small extent. The noise is considerable. Yet another example for these steel slips are those at Messrs. Wm. Beardmore's new ship yard at Dalmuir, Glasgow, Scotland, which are illustrated in Fig. 5. This structure dis- tinguishes itself from the two described above by the arrange- ment of its cranes. On each side of the berth four jib travel- ing or walking cranes are provided, having a lifting capacity of 5 tons and a reach of 30 ft. The rails for these cranes are supported by the vertical members of the shed. At the same time a high-speed traveler spans the slip, capable of dealing with weights of 15 tons. By this arrangement the sides of the vessel under' construction can be served without