A LIST OF 



NEW OPTICAL INSTRUMENTS, 



CONSTRUCTED 



By ANDREW PR1TCHARD, No. 162, Fleet-Street, London. 



All the following instruments drawn and described in the Micrographia are marked 

 with the letter M., and the number following it refers to the page ; those described in the 

 Microscopic Cabinet have the letters. 1 )/. C.j and those given in the new edition of the 

 Microscopic Illustrations have 31. I. 



£. s. d. 



1. Pocket Microscope, with single magnifiers, (M. C. 243) 2 2 



2. Vertical Microscope, with solid gun-metal bar, (M. I.) 5 5 



3. ,, „ Achromatic, (M. I.) 7 7 



4. ,, „ „ » (1 set best glasses) ... 10 10 



5. Achromatic Microscope, with stand and round foot (M.I. ), ^lO. 10s. to 15 15 o 

 6- » „ » tripod,, (M.I.) ^12. 12s. to 18 18 



7. Single „ „ „ „ (M.I.) ..10 10 



8. Achromatic „ „ „ „ with candle holder, 



condenser, dissecting rest, aquatic live-box, &c. in maho- 

 gany cabinet, with drawers 21 



9- „ „ u „ „ ditto, with 2 sets 

 object-glasses, 1 best and 1 foreign, moveable stage, phial- 

 holder, 6cc. in cabinet 26 5 o 



10. „ „ „ „ „ ditto, with from 3 



to 6 sets best object-glasses — 3 Huygenean eye-pieces, 

 micrometer, drawing, and camera lucida eye-pieces — fine 

 adjustment; dissecting apparatus, &c. as described in 

 M.I. chapter vi ,,£35 to 



11. Goring's Aplanatic Engiscopes, (M. I.) o£25 to 



12. ,, Improved Amician Reflecting Engiscopes, (M.) ^18 to 50 



13. „ Phial Microscopes, (M. I.) 5 5 



14. Wollaston's Doublet Microscopes o£2. 12s. 6rf. to 10 10 



15. Solar Microscopes 15 15 q 



16. „ „ with achromatic glasses 



17. „ „ with opaque apparatus 



18. Lucernal Microscopes 



19. Microscopes for measuring refractive powers 



20. Single Dissecting Microscopes 7 7 



21. Oxy-hydrogen Gas Microscopes 40 



22. ,, .. » second size o£l0. 10s. to 25 



23. „ „ Polariscopes 



This apparatus exhibits on a screen the system of rings, colours of 

 thin plates of crystals, unanuealled glasses, prismatic spectrum, &c. 



24. „ „ Apparatus for either of the above instruments, on 

 various constructions ^8. 8s. to 25 



The construction of this apparatus is greatly simplified, and, independent 

 of its use for the microscope and polariscope, is admirably adapted for 

 shewing the combustion of metals and chemical experiments re- 

 quiring intense heat. 



25. Improved Clock-lime Holders 



26. Object-glasses, cylindrical, or Stanope 



07. grooved sphere, or Coddiugton 



28. „ concentric, or Brewster's ... 



29. n Goring's double 



;50. „ Herschel's aplanatic 







