The only inducement to slow was when going head to it (which often meant head through it), to avoid the inconvenience of shipping a heavy body of "green sea" on deck forward.

A turtle-back was therefore provided to throw it off, which proved so satisfactory, as it had done on the Holyhead and Kingstown boats, that all the subsequent vessels were similarly constructed.

Thus, then, as with the machinery, so was the hull of the Oceanic, a type of the succeeding vessels, which after intervals of a few months took up their stations on the Transatlantic line.
Having often observed, when at sea in heavy weather, how the pitching of the vessel caused the weights on the safety-valves to act irregularly, thus letting puffs of steam escape at every heave, and as high pressure steam was too valuable a commodity to be so wasted, we determined to try direct-acting spiral springs, similar to those used in locomotives, in connection with the compound engine.

But as no such experiment was possible in any vessels requiring the Board of Trade certificate, the alternative of using the Camel as an experimental vessel was adopted.

The spiral springs were accordingly fitted upon the boiler of that vessel, and with such a satisfactory result that the Board of Trade allowed the use of the same contrivance on all the boilers of the Oceanic and every subsequent steamer, and the contrivance has now come into general use.
It would be too tedious to mention in detail the other ships built for the White Star line.