A Treatise on the KaleidoscopeArchibald Constable & Company, 1819 - 166 էջ |
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Common terms and phrases
angle A O B angles of 90 angles of incidence angular aperture angular point aperture apparent magnitude applied beauty brass rim Camera Obscura catoptric centre CHAP circle circular field coloured glass combination composed constructed convex lens DEUTSCHES MUSEUM direct vision distance effects produced equal exhibited eye end field of view figure fixed flectors focal length fragments half Hence images formed inches inclination Indigo instru instrument intensity inverted image ject Kaleido last reflected last sector leidoscope lens light looking-glass manner ment mirror BO motion move number of reflections number of sectors object plate optical ornaments pattern pieces plane mirrors Polyangular polygon position principles rays rectilineal reflected images reflectors at angles regular polygon ring RR round scholium screws seen by direct semitones shewn in Fig shews side specula speculum speculum metal square stationary surface symmetrical picture symmetrically related three reflectors tion transparent triangle tube velocity