ogramme, and reach- ing in the latter case a spread of wings of more than two origin is lost in the depths of time. Among the atiempts BY VICTOR TA‘IIN. that have been made since, none has given a real result, and meters. In our smallest models the rubber spring was The purely mechanical solution… … from remarking that the disposable weight was very feeble Fig. 1—TOY HELICOPTERON, understand the means that she employs. It seems to us in- ‘in proportion to the considerable work demanded of the ex admissible to construct a mechanical bird in order to navi- gine. Notwithstanding the contrary…
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