The young gentleman and lady's philosophy : in a continued survey of the works of nature and art by way of dialogue . rate the Doftrine oftefledling Telefcopes by Figure I. II. of Plate 48, as it will greatlyfiffift the Imagination in reprefenting the Courfe of the Rays of Lightsby right Lines drawn in the Manner as the Rays are refle, pq, c i, Co as toproduce diltinft Vmon upon the optic Nerve in the Eye in the inver-ted Pifture rsp i by obferving the Courfe of thofe Rays, or Lines,the Reader will have a better Idiea of what Ivas delivered on thisSubjed in a former Dialogue, ,:;^BEGINmG &END
The young gentleman and lady's philosophy : in a continued survey of the works of nature and art by way of dialogue . rate the Doftrine oftefledling Telefcopes by Figure I. II. of Plate 48, as it will greatlyfiffift the Imagination in reprefenting the Courfe of the Rays of Lightsby right Lines drawn in the Manner as the Rays are refle, pq, c i, Co as toproduce diltinft Vmon upon the optic Nerve in the Eye in the inver-ted Pifture rsp i by obferving the Courfe of thofe Rays, or Lines,the Reader will have a better Idiea of what Ivas delivered on thisSubjed in a former Dialogue, ,:;^BEGINmG &END ^/-V/4:EGRESS ^^YTSViXJS^vmt/K SOLARDISK. and Ladys Philoso^hit. 249 iias all the Advantages that any Inftrument of this Kind carlhave, and feveral more than are found in the Common Sort, as Iihali take an Opportunity hereafter to fliew you more particu-larly ; * and, at prefent, I have another optical Inftrument to de-fcribe, which I fancy will give you equal Pleafure with rhany ofthe foregoing, efpecially as it contains, in a frhall Compafs, ageneral Ptaxis of optical Experiments: The Inftrument I meartis a new phpdrttonal Camera Obfcura. Euphrof. Its a pretty Inftrument, I allow i but how doe3this differ from the common Camera Obfcura ? Clem, In three refpeds: Firft, in the Form; but this is the leaft 6f all material. Secondly^ it forms an Image in any affignable Proportion to the Object, in all Degrees below Equa-lity. —Thirdly, //7^«s Microfcope is adapted to it, for exhibiting a large Image of any very fmall Object. Euphrof. By what you havefaid, C/^<7«/Vzij, I fuppofe theUfebf this Camera is principally for Draw
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Keywords: ., bookcentury1700, bookdecade1750, booksubjectscience, bookyear1759
