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PREFACE.

a better word can be found. It has at least the merit of expressing the idea clearly, and with both philologic and scientific accuracy.

Alex. B. W. Kennedy.

I may add that Prof. Reuleaux has sent over some three hundred models, a portion of his Kinematic collection at the Berlin Gewerbe-Akademie, to the Exhibition of Scientific Apparatus now (May 1876) being held at South Kensington, where they will remain throughout the summer. Among these models are a great number of the mechanisms described in the following pages, along with many others. They will well repay a visit, or more than one, and as close examination as circumstances permit. Herr Kirchner, of the Berlin Akademie, has charge of the models, and will be as well pleased as he is well able to give explanations about them.