The economy of the eyes. Pt. 1, Of spectacles, opera-glasses, theatres, etc. / By William Kitchiner.

  • William Kitchiner
Date:
1826
Catalogue details

Licence: Public Domain Mark

Credit: The economy of the eyes. Pt. 1, Of spectacles, opera-glasses, theatres, etc. / By William Kitchiner. Source: Wellcome Collection.

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    PACE English Operas. Sask Oe 2: Tesvewe ws» 164 Magnifying Power, how to vary. .........- 165 To see if any of the Object Glass is cut off .. 166 ‘Diameter of Eye-Glass 2.2.00. eee 167 Do. Ryecheat: 205 Fits co bets © o~ 168 Average Distance that’ a common Eye can see distinctly the Expression of the Coun- +. Cenaince + seins Cte aire ee ores Soe 8 ae 169 Average Distance between Spectators and Per- formers) 6 CEASE CO Rae Tee 169 Requisite Magnifying Power to enable Persons to see as distinctly as if they were within 15. feet'of the Stage 2 OU PP Ae. 169 The Bell Opera with one sliding Tube the OeGe SAA IS Pe we anes 169 Of Operas which have many Tubes ........ 169 Operas for the extremely Short-sighted. .... 170 Operas that have no-focus 206.2 PS. eee 172 Invisible-Opera Glasses o:)0 6052 2. COON 173 Opera-for-a Pictiiré Gallery (Sp 173 Opera for sweeping for a Comet .......... 174 The Ouranologia s(t etere. PSR OS on 174 Binocular: Opens S200 a8 Va a ae 175 Single: Object: Glasses. otis 09 9 ot Pa 176 Concave Eye-glasses for varying the Mag- hifyine td Owens PRIEST Ok OT ear 177 To ascertain the- relative Powers of Eye- plasses WiitinScUlin shin gece eerie ess 6 os 177 Imperfections in Opera Glasses, to discover.. 180 Prices of Opera-Glnsses (ei poe. a et 180 Cautions in trying Opera Glasses .......... 18] Comparisons of Single and Double Object Gilopses sissies 4s CEO SUien BE. o's 183