Shipbuilding and Shipping Record . the ribs. The reinforcement is next put into placeeverywhere before casting is commenced. The general arrange-ment of the reinforcing rods can be seen from Fig. 4. The cement isthen cast on the inner mould of the required thickness, no outer the darkest part of the night. Setting of the concrete takes about threeweeks, so that a vessel can be built on the same bedding once everysix weeks. During the casting 40 men were employed on the work,and for a short time up to 55 men. The work was done partly byhand and partly by air pressure with apparatus specially co
Shipbuilding and Shipping Record . the ribs. The reinforcement is next put into placeeverywhere before casting is commenced. The general arrange-ment of the reinforcing rods can be seen from Fig. 4. The cement isthen cast on the inner mould of the required thickness, no outer the darkest part of the night. Setting of the concrete takes about threeweeks, so that a vessel can be built on the same bedding once everysix weeks. During the casting 40 men were employed on the work,and for a short time up to 55 men. The work was done partly byhand and partly by air pressure with apparatus specially constructedfor the purpose. No outer layer of finer material was put on, asthe whole substance is of very fine material. This was carefiUlypolished on the outer surface. The mould was constructed of good solid material, in sections, sothat it could easily be taken apart and re-erected. The mould willbe used a great many times, it being recognised that provided largenumbers of standard types are built, the production ^v^ll doubtless. Fig. Wooden Inner Mculd on Launching Cradle. Fig. The Stem being Cast
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