Great facts : a popular history and description of the most remarkable inventions during the present century (1860)
Bakewell, Frederick C. (Frederick Collier), 1800-1869 · New York, D. Appleton and company · leaf 110
cts may be turnedround, by which means the pieces of glass shift theirpositions, and the figures instantly change. The sameeffect is produced, though in a less agreeable manner,in the common kind of instruments, by turning thetube. To form by the combined reflections from the twoglasses a perfectly… … the accompanying diagram, the ends of the flat silvered glasses a c^1) G^ are inclined at anangle of 60 degrees ;therefore the circleis completed by thejunction of six sec-tors. In such a Ka-leidoscope, the circu-lar figure will beformed by three re-flections from eachglass To make the formation ot…
Inventions
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-120-333.webp)
