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Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. -

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  1. OPTTCKS, is a Mathematical Science that ( plain.) When the Clals is in chis Pocture, it
  2. TreatS oF the Sixht in gerreral, and OF CVerY
  3. chins chac is leen wich direct Pays; aud explains
  4. the leveral Properries and Fftects oF Vision ir
  5. general, and proverty ot thar which is direct
  6. ard ordinary: For When the Rays ot Lighe are
  7. considered as reflected, the Science which ceach.
  8. es their Las and Properries, is called Carop.
  9. erictes; and when che Retraction oF Rays is con
  10. Bdered, and che Laws and Nacure oF ic explain-
  11. ed and demonstrated, the Science is called Diop.
  12. erickes. S0 char Opriekes comprehendsthe Wr hole
  13. oE vitich, Caropericts and Viopericts, are che
  14. EWVO PATIS
  15. OPTTCIS Classes. MIP. Nemton, in his Phi
  16. los. Natur. Princip. Math. Lib. T. Schol. ad Prop. 98
  17. Cays, Thac For all Oprick Dles, Spherick Figures
  18. are the most commodious. IF the Object. CilaI-
  19. ses oF Telescopes ere compoled ot tro Spherick
  20. Classes containins Wacer becweenthem, perhapo
  21. the Trregularier os che Refractions chat are made
  22. on the Surtaces oF the Glates corards cheir
  23. Fdges, may be accurarely enough corrected b
  24. he Retractions ot the Vacer. And Puch Object.
  25. Glasses are preferable to Elliprick or Pyperbolict
  26. Glases, noc ontr because ther are casier and
  27. more accurarely ro be formed, bur also because
  28. cher resract more accuratelr those Pencils ot
  29. che brishe Spor be projected just in che midele
  30. oF ehe Fainter Lishe, the Cla(S is vell centered
  31. BHE 1O Wtarever Side oF che faint Lighe ehis
  32. brizhe Spor is projected, on that side is the ClaES
  33. chickest, and on chac side lies chetrue Contre.
  34. A Third Way
  35. Os Examinins the Centres os Glasses, is vet more
  36. Compleat than the former: For it does not ont
  37. discover the Fault, (if there be any, as in lons
  38. Object Glases tis very rare but there is, espe
  39. cially is they be mroueht in the Form by the un-
  40. suided TTand, and not by an Engine) but mith.
  41. al it rectisies the Fault; and is thus:
  42. Corer the Surtace oF the Clals with a thin
  43. piece of Paper, in which chere is cur a ronnd
  44. Holc oF about an Inch Diamerer; aboue this
  45. HIole Fhere arC IO BC APUCK ENO OE ChrCC C On-
  46. centrick Circles. More this Paper uxon ttie
  47. GlaIS, Fil rou sec on the Plane That receires
  48. che reflected Lighe, thac the bright Spor is ex
  49. actly in che middle of che ocher Fainter Listc
  50. round il.
  51. This also one may meature by a Pair oF Com-
  52. RaYS FAEare (collateral, OF) OuE OF the Glases passes, havins, co rhac end, Dighely Ax d che Pa-
  53. AXIS. Bur che different Refrancibility ot diste-
  54. rene Rays ill For ever hinder us From pertectine
  55. Opticks by Glases, cicher Spherick, Or oF any
  56. octer Fisures Whatloerer: And untess we can
  57. correct the Frrors that arise from hence, all our
  58. Labour is lost in orter Corrections.
  59. Nor indeed is it porsible, by whacerer Figures
  60. EO render the ApPCarance OF the Collateral PAFES
  61. per co che Clals, thac e mar more nicely de
  62. termine whecher chis bright Spor be exactly in
  63. chemidale. This cheretore beins caretully ad-
  64. justed, by senely Didins che Paper on che Cla(S
  65. (it ic be requisire) wre are, without the leact
  66. alterins this erue Position ot the Paper, t0 Ax ic
  67. more tirmly ro the GlaIS; and lavins ic thus on
  68. a TablC, let us marke on the Cla(S (By the Point
  69. of an Object (0 distinct as the Direct; For the oF a Diamond) chree Poines in one ot the C ir-
  70. very NaturaL Fre does it nOF: And cheretore e cumterences concentrick ro che round HTole in
  71. are Forced ro apply ic successireY, directly Be-
  72. Tore che ParrS oF any Object ve desien +
  73. vieW.
  74. T0 lnon mbecher Oprick. Clattes be truly Cen
  75. rered, or not.
  76. Fiest Way.
  77. Candle; For where those euo Imases unite, ot
  78. the Paper; and sticking a (mall piece ot Ce
  79. mene on te Olals, about che midale ot che
  80. round FTole, by means oE che chree marted
  81. Poines let us Aind the exact Centre ot chis round
  82. Hlole: Then uncorering che wtole Cta(S, (ex
  83. cepe omy che Cemenc in wtich che Centre is
  84. marke d) vich a Diamond Poinced Compals let us
  85. Arike as larse a Circle on ihe Cilals as iis Breadch
  86. Will bear; then round the Ctals accordine ro rtiis
  87. Circle, and ris as exactly centred as the Sense
  88. can judee.
  89. FToldins che Classes al d due VITance HO
  90. the Fre, obserre the rwo resected Imases oF 2
  91. coalesce, chere is the true Centre of the Claß
  92. And it ehis De in the midale or central POinE0
  93. the ClassS Breadch, the Clals is truly centered.
  94. For eryns the Rezularies and Goodness of an b
  95. ject. ClalS, 1othe greatest Lxactnest,
  96. On 2 Paper strike truo Concentrick Circles.
  97. one whole Diameter is the lame wichthie Breadct
  98. OF the Object. Ctals, e’orher, oF halF rhac Dia-
  99. meter: This invard Circumterence divide into
  100. six equal parts, by che Hnoun wax ot applyine
  101. makeins six sine sinall Holes cherein with 2
  102. ich ehis Paper, and chen expolins it tothe Suns
  103. We are ro receire the Rays chat pals chrougtr
  104. Proachins chis Plane trom or ro the Cilals, We
  105. oriohtest Spot iS EO BC DIM into the smallest Phall find Whether che Rays thac pass chrouoh
  106. Compalo cac ic can. CL rial will mabie alt chis) chese six Holes unice: exactis rovethex ac ans
  107. Distance
  108. A Secona. N a) IS,
  109. By presentino che Glals besore the Sun, and
  110. rallel ro irs Surtace, and at a proper Distance; the Radius six rimes in che Circumference, and
  111. For rhen roul percetre cuo lous d lis le
  112. visorous, wichin anocher more faint and larse
  113. Then by a due Posture oF the Ctass (found by
  114. round as possible, and aE a PFOPeF DITaNCCHOIM From rhe CtaIs; and by wich- drawins or ap.
  115. makins LL TCHCCLCHC LGMCOI a PTaI MSIs Pa
  116. Aected, onc smaller, bur much more strons and Nccdle. Ler us corer one side of che Cla(S
  117. TrialS) Both These Lighrs are ro be projected as rhese SX FToles, on a Plane, ae a just Distance
  118. the Wall on ertich cher are reflected; the round

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Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. - . Machine transcription, not an edition: Leibniz Legible (model FoNDUE-GD_v2_ft_Leibniz, run 74). https://leibnizlegible.com/page/806933011:0576?run=74