Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 528
by viewing the designs in any manner which entirely pre-vents the movement, as by fixing the gaze on one spot in the case ofFig. 247, when the illusion will vanish; but this plan is not so easily appliedto Fig. 248. A convincing proof, however, will be found in the appearanceof these figures when… … Fig. 248. ♦^ill see them distinctly without the illusions as to the non-parallelism of thelines. In the absence of an electrical machine, or coil and jar, the readermay have an opportunity of seeing the figures by flashes of lightning atnight, when the result will be the same. There is a property…
Inventions
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![An illustration from [Gazes, 1890-1901; collection Roubaudi et Fils] (1901)](https://img.insideoutlibrary.com/img/200/ia-gazes1890190100elem-87-191.webp)
