722 A Catalogue of Instruments. 



£• *• " 



Telefcopes of various lengths, fizes, and prices 



Telefcop'es to life at fea by night — ► ■ i l l 



Acromatic profpects, from 15s. to — — 2 12 



Acromatic telefcopes, with brafs drawers, which may be drawn out at 



once, and that fhut up, conveniently for the pocket, from il. 11s. 6d. to 13 

 An optical vade mecum, or portable acromatic telefcope and microfcope, 



&C. for tranfparent and o pake objects, &c. from 3I. 13s. 6d. to 4 14 



A thirty inch acromatic telefcope, with different eye pieces for terreftrial* 



and celeftial obje&s, from 81. 8s. to- — — it 11 



Ditto with rack work 



An acromatic telefcope, about three feet and an half /long, with different. 



eye-pieces — — • — 18 18 



Reflecting telefcopes of all the various fizes 

 A three foot reflecting telefcope, with four magnifying powers 

 A ditto with rack work — — 36 15 



A two foot reflecting telefcope, with rack work; and four magnifying 



powers — — — 21.0 



A two foot reflecting telefcope, with two magnifying powers - 12 ■ 



An eighteen inch ditto — — — 8' 8 



A twelve inch ditto — — 5 5 



Double reflecting microfcopes, from 3!^ 13s. 6d. to — - — 21 o 



Ellis's aquatic microfcope — • — 2 2 



Wilfon's microfcope, improved — ■ — — 212 



Adams's lucernal microfcope for opake and tranfparent objects, being the- 



moft perfect inftrument of the kind "hitherto contrived, affording more 



entertainment and inftruction than any other inftrument — 210 



Solar microfcopes — • — - 5 5 



Ditto for opake objects — — — 16 16 



Ditto — — — 21 o 



Camera obfcuras, from 8s. 6d. to — — <• 7 7 



Glafs prifms, from 7s. 6d. to — — — 22 



Magic lanthorns — — 1 5 



Geographical and Aftronomical Inftruments. 



Adams's new eighteen inch globes, mounted in the moft approved form, 



from 9I. 9s. to. — •-- ~~ 2 7 .. 0 



Ditto 



4 



