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JOHN J. GRIFFIN & SONS, Ltd 



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MAKERS OF SCIENTIFIC APPARATUS TO THE ADMIRALTY, 



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 APPARATUS. 



Registered Form of Gold Lear Electroscope 



Will hold its charge for a wetfc. 



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Particulars. In all sizes. With Glass or Ebonite PJates. 



2Q-26 SARDINIA STREET, LONDON, W.C. 



W. WATSON & SONS' MICROSCOPES, &c. 



WATSON'S 



"H" EDINBURGH STUDENT'S 



MICROSCOPE. 



WATSON'S 

 FRAM ^^3 MICROSCOPE. 



Stand with i Eyepiece £9 10s. 



Ditto, completely fitted with 

 2 Eyepieces, i in. and J in. 

 Objectives. Abb6 Illr. and 

 Case £15. 



No other Microscope combines 

 so many mechanical conveniences 

 and workmanship of such perfect 

 character at so low a price. 



WATSON'S 

 HOLOSCOPIC EYEPIECES. 



Prmnsio7ially Protected. 



Provided with adjustment to render 

 them over or under-corrected, they 

 can therefore be used with either 



Apochromatic or Achromatic 



Objectives. 



Price 



17S. 6d. each. 



A Highest-class Microscope at a very 

 moderate cost. 



Set X. Stand with i Eyepiece, i in. and \ in. 

 Objectives in Case, £6 16s. 



Watson's Catalogue of Microscopes and Apparatus (No. 2) contains full particulars of their celebrated instruments. 

 Watson's Catalogue of Microscopic Objects (No. 3) is a Classified List representing a stock of 50,000 first-class specimens. 



POST FREE ON APPLICATION TO 



W. WATSON &. SONS, Opticians to H.M. Govt, 313 High Holborn, LONDON, W.C. 



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