Dear editor, The articles by Keith Ray and J E Page have been interesting and useful in defining the gradual acceptance of the azimuth thruster during and after WW2 and its application to an ever wider range of vessel types. But the azimuth thruster also has a prehistory in the 19th century. My curiosity was first aroused by a wooden model displayed in the Science Museum in London, labelled as a Mallory propeller with an accession date of 1879. As the museum had no detailed information on this exhibit I decided to research the matter further.
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机译：亲爱的编辑，Keith Ray和J E Page的文章在定义二战期间和之后逐渐接受方位角推进器及其在越来越多的船只类型中的应用方面非常有趣和有用。但是方位推进器也有19世纪的历史。我的好奇心最初是由在伦敦科学博物馆展出的一个木制模型引起的，该模型被标记为马洛里螺旋桨，加入日期为1879年。由于该博物馆没有该展览的详细信息，我决定进一步研究此事。
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