224 



NEGKETTI AND ZAMBEA, HOLBORN VIADUCT, E.G. 



FIG. 701. 



FIG. 705. 



FIG. 703. 



FIG 706. FIG. 708. 



706 Stanhope Lenses, in German Silver mountings 



(figs. 706 and 706*) 036 



Ditto ditto in Tortoise-shell ditto 10 6 



Each. Each. 



s. d. s. d. 



707 Ditto 



050 

 12 6 

 ditto, in Silver ditto 10 6 15 



FIG. 704. 



708 Stanhope Lens, mounted with shade for the eye, and 



tube for improving the definition, magnifying power 

 180 diameters (fig. 708) 



This powerful and convenient lens 

 is the invention of Lord Stanhope. 

 The portability, low price, and the 

 facility with which iti can be used, 

 recommend it strongly. With it may 

 be seen the animalcule in water, eels 

 in paste and vinegar, farina of 

 flowers, the down of moths, &c. ; 

 and if a drop of solution of salt be 

 spread lightly over the end of the 

 lens, and viewed without delay, the 

 formation of crystals will be 

 beautifully seen. 



709 Coddington's Spherical Lens, in German silver 



Mounting 3s. 6d. 5 



710 Ditto ditto in Tortoise-shell . . . . 10 6 



711 Ditto ditto in Silver 15 



712 Pocket Magnifier, with two plano-convex lenses, 



diaphragm, and a Stanhope or Coddington lens, 



in Tortoise-shell mountings (fig. 712) . . 12s. 6d., 16 6 



12 6 



FIG. 712. 



10 



15 



1 5 



150 



The most useful pocket magnifier or microscope introduced, magnifying power 10 to 80 diameters. 



