The hold is divided along the centre as well as across by several bulkheads (Figs. 20 and 21). By the kindness of the builders, Sir W. G. Armstrong, Mitchell and Co., the Author has been able to give a drawing of one of these ships, which was constructed according to the design of Mr. Swan.

It will be seen on reference to the cross-section, Fig. 21, that the petroleum hold is made considerably narrower above the level of the water-line, the object of this arrangement being to ensure that the main part of the hold should be perfectly full, the narrow part at the top giving ample facilities for the expansion of the oil.

If the petroleum were contained in one hold of the ordinary shape, not perfectly full, the stability of the vessel would be seriously affected. A pump is provided capable of discharging from 100 to 120 tons an hour, the suction-pipe of which has a branch fixed to each of the separate holds.

Midship Section of Joggled Plated Steamer for Carrying Oil in Bulk - similar to Fig.21 above.