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 Lawrence Hargrave: 'Evolution of the Flying Machine I' (1885-1889) Image 4

Two models showing trochoidal actions of fish swimming.

 Lawrence Hargrave: 'Evolution of the Flying Machine I' (1885-1889) Image 5

A model of trochoidal action of many footed progression and another model of trochoidal action demonstrating how to float and propel itself in water.