William Froude's early work, and his first paper for The Institution of Naval Architects, enquired into the question of why vessels roll as they do. In this he established the methodical approach that was to lead to perhaps his most valuable contribution: bringing respectability to model testing as a means of predicting ship powering requirements, performance and behaviour before building in full size. This paper set out the forces causing a vessel to roll in a seaway, including resonant rolling, and was founded on close observation of the behaviour of a small float equipped with a mast from which a pendulum was suspended. Deductions were backed up with solid mathematics, almost too solid. Froudes groundbreaking work was acknowledged, but, as with other aspects of ship behaviour in a seaway, detailed mathematical analysis was impracticable in the pre-computer age. At later INA meetings he presented empirical solutions that made the ideas usable.
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机译：威廉·弗洛德（William Froude）的早期工作以及他在《海军建筑师学会》（The Institution of Naval Architects）中发表的第一篇论文，都问到了为什么船只会像它们那样滚动的问题。在这种情况下，他建立了有条理的方法，这可能会导致他最有价值的贡献：在模型测试中引入可敬性，以此作为在全尺寸建造之前预测船舶动力需求，性能和行为的一种手段。本文阐述了导致船只在海道中滚动的力，包括共振滚动，并且是基于对装有桅杆的小型浮子的行为的密切观察而建立的，该桅杆上悬挂着钟摆。推论得到了坚实的数学的支持，几乎是非常坚实的。 Froudes的开创性工作得到公认，但是，与海上航行中船舶行为的其他方面一样，在计算机时代之前，进行详细的数学分析是不可行的。在后来的INA会议上，他介绍了经验性的解决方案，使这些想法可用。
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