, SCIENCE- G OSSIP. 



AMNH LIBRARY 



100164826 



JOHN J. GRIFFIN & SONS, Ltd 



f 



MAKERS OF SCIENTIFIC APPARATUS TO THE ADMIRALTY, 



TO THE WAR DEPARTMENT, and to the INDIAN and 



COLONIAL GOVERNMENTS. 



RONTGEN RAY APPARATUS of all DesGH/tiions. 



INDUCTION COILS 



Manufactured in our own 



WORKSHOPS, and of 



GUABANTEED 



WORKMANSHIP. 



X-RAY TUBES 



Specially constructed to 

 withstand Heavy Currents. 



LAMP RESISTANCES 



Our Own Special DESIGNS, 



Adapted for use with 



MAIN CIRCUIT 



CURRENTS. 



Full particulars and Demonstrations upon application. 



ao— 26 sai^oinij?*. street, ]L.ONr»ON^, mr.c. 

 W. WATSON & SONS' MICROSCOPES, &c. 



WATSON'S 

 "H" EDINBURGH STUDENT'S 



MICROSCOPE. __ 



WATSON'S 



HOLOSCOPIC EYEPIECES. 



Froz'isionally Protected. 



FRAM ^ 



WATSON'S 



MICROSCOPE, 



Stand with i Eyepiece .. £9 10s. 



Ditto, completely fitted with 

 2 Eyepieces, i in. and \ 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. 



A Highest-class Microscope at a very 

 moderate cost. 



Set X. Stand with i Ej'epiece, i in. and \ in. 

 Objectives in Case, £6 1 5s. 



Provided with adjustment to render 

 tliem over or under-corrected, they 

 can therefore be used with either 



Apochromatic or Achromatic 



Objectives. 



Price 



17s. 6d. each. 



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 represf nting a stock of 50,000 first-class specimens. 



POST FREE ON APPLICATION TO 



W, WATSON & SONS, Opf/c/a/is to HM. Govt,, 313 High Holborn, LONDON, W.G. 



ESTAI3USHED 1837.! |6 FORREST ROAD, EDINBURCH, AND 78 SWANSTON ST., MELBOURNE, AUSTRALIA. 



•SiTj mswontiR ."v Co. Prin ricus, NEW-sTURi.yi- Si.takf., Lonuon. 



