New School Projection Lantern C 



Every teacher today recognizes the advantages to teacher as 

 well as pupil of the wider use of the Projection Lantern in the 

 classroom. 



Our Lantern C has been especially designed for school work. 

 It is a thoroughly high-grade Apparatus, and while equipped 

 with our latest improvements we can offer it at a price which 

 brings it within the reach of even the elementary school. The 

 construction of this Lantern is such as to permit the instant change 

 from ordinary projection to microscope projection, and thereby 

 adds greatly to its scope of usefulness. 



The advantages of a Lantern in the social affairs of a school 

 ivill ajso readily suggest themselves. 



This device is simple, efficient, portable — may be easily re- 

 moved from one room to the other — and practically covers the 

 whole range of school projection work. Price complete, $50 ; 

 with Acetylene Burner, $45. Send for descriptive circular. 



Bausch & Lomb Optical Co 



Carl Zeiss, Jena 

 Offices: 



New York 

 Boston 

 Chicago 



ROCHESTER. N. Y. 



George N. Saegmuller 

 San Francisco 

 Washington 

 London 

 Frankfort 



WATSON & SONS' 

 EDINBURGH 

 Student's Microscope 

 Model " H " 



The most popular 

 British made Mi- 

 croscope. 



It combines all 

 the requirements 

 that original re- 

 search, high-power 

 work and photo- 

 micrography call 

 for, including 

 coarse and fine Ad- 

 I justments of high- 

 est precision, me- 

 chanical move- 

 ments to stage and 

 compound Sub- 

 ^-^a stage, with screws 



><!S ^^^S 9b to center and rack 

 work to focus. 



Stand only, price £ 9 12 6 



With § and J Objectives, 2 oculars, Abbe 

 Illuminator with Iris diaphragm, and 



Mahogany case 15 o 



Oil Immersions ^j " 1.20 N. A 4 '0' 



1.30 " :~ BSOjO 



Illustrated 178 page catalogue of microscopes" and accessories 

 mailed free on request; more than 20 models to select from at 37/6 up 

 Microscopes may be imported free by Educational Institutions. 



WATSON & SONS, Microscope Manufacturers, 



WHOLESALE AND RETAIL 



313 HIGH H0LB0RN, LONDON, ENGLAND 



Estaqlished 1837. Awarded 42 Gold and other medals — micro- 

 soopie Objects may be conveniently sent to the U.S.A. by parcel post. 

 American Agents: The Scientific Shop (A. B. Pobtbb) Booms 1230- 

 1245 Monon Building, 324 Dearborn Street, Chicago, through whom 

 orders should be sent. 



For showing on the screen opaque objects, book 

 Illustrations, engravings, and lantern slides. 

 It is the most perfect instrument of its kind. 

 It has a detachable Book-Holder. 

 It concentrates all light on the object. 

 It shows printed matter correctly. 

 It is in use at 



Harvard, Cornell, U. of P., Leland 

 Stanford, Girard College and 

 hundreds of other institutions. 



Wireless Telegraph Outfits 



For school room and experimental work. Com- 

 plete sending and receiving stations. 



Lantern Slides — Microscopic Slides 



Illustrating' Botany, Geology and other sciences. 



L,ists on application. 



WILLIAMS, BROWN & EARLE, 



Dept. N, 918 Chestnut Street, Philadelphia, Pa. 



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