LENSES 23 



Such burning glasses 12 and 16 inches in diameter were used by 

 Joseph Priestley, c. 1770, who obtained them from Samuel Parker 

 (d. 1817), a London optician. 



111. Portable Camera Obscura. c. 1700. 



9 inches x 3^ inches. Orrery Coll. 38. 



112. Sky Optick, with convex lens in Lignum vitae ball. c. 1750-1800. 

 ? cf. Gehler, Phys. Wgrterbuch, v, Leipzig, 1795, p. 82. Oriel College. 



. 

 MICROSCOPES 



113. Wilson's Pocket or Screw Barrel Microscope. 1702. 

 By Wilson. Ivory body. 



Orrery Coll. 26. 



Complete with lenses, object forceps, &c., in shagreen case (Phil. 

 Trans., No. 281). 



114. Small Screw Barrel Microscope. Later than 1702. 



By (or after) Wilson. 



Clarendon Laboratory. 



115. Double Microscope for viewing the Circulation of the Blood. 



1693- 



By John Marshall. 



No. 8, Orrery Coll. Ch. Ch. 



This microscope is of the very greatest importance from the stand- 

 point of the history of the instrument, on account of the extreme rarity 

 of models of this period; and the historic value of this particular 

 instrument is all the greater because it has been shut up in a cupboard 

 with the rest of the Orrery apparatus since 1720. It is therefore 

 likely to be in its original state. 



116. Microscope with Wooden Body and Tripod. ? 1750. 



Pitt-Rivers Coll. 

 A modification of the Culpeper and Scarlet model of 1738. 



117. Culpeper's Microscope. 



Ivory body on brass pillar stand. Pitt-Rivers Coll. 



Marked E. Culpeper, Londini. 



The folding feet of the stand are engraved : 



Microscopes Telescopes & all sorts of Optick Glasses Improved and made 

 to y greatest perfection by EDM: CULPEPER co MATHEMATICAL 

 Instruments of all sorts in Gold Silver Brass Ivory & Wood accurately 

 divided & made to ye greatest perfection. 



Spectacles Reading Glasses in great Variety of Convex and Concave 

 Glasses also Load Stones. Set in Gold and Silver &c. 



