KNOWLEDGE. 



March, 1915. 



NEW Bauscfi '|om[» UNIVERSAL BALOPTICON 



This new Science Lantern is the outcome of many years' 

 careful study in projection lantern construction, and offers 

 many facUities to render projection of the various kinds successful 

 in every way. 



The projection lenses and condensers are carefully chosen 

 to suit the source of illumination and projection distances, in 

 order to furnish well-defined and brilhant images of either opaque 

 or transparent objects on the screen. 



The manipulation of this apparatus is the simplest possible, 

 and the change from one mode of projection to the other only 

 requires a few seconds. 



This apparatus is also arranged to be equipped for either 

 Cinematograph Projection or Projection Microscope. 



It is a universal projection apparatus in the true sense, and has 

 already met with great favour in many Scientific Institutions and 

 Learned Societies. 



Price of the complete outfit, with vertical ^, _ _ ^ _ - _. 



attachment, and with projection microscope £44 15 1 O 



Same outfit, with vertical attachment, but ^,^^ g^ -^ 



without projection microscope £36 9 2 



Demonstration of this Instrument will gladly be given in our New Demonstration Rooms by appointment. 

 DESCRIPTIVE BOOKLET " Oi V.2 " (BALOPTICONS) ON APPLICATION. 



MICROSCOPES (over 100,000 sold), MICROTOMES, PHOTO-MICROGRAPHIC and DRAWING APPARATUS, CENTRIFUGES, GANONG'S APPARATUS 



for PLANT PHYSIOLOGY, VISCOSIMETERS, 4c. 



Also 



N.B ALL OUR INSTRUMENTS BEING MADE AT OUR OWN 



FACTORY IN ROCHESTER, N.Y., THERE WILL BE NO DELAY IN 

 DELIVERY, AND WE HAVE JUST RECEIVED LARGE STOCKS. 



BAUSGH & LOMB OPTICAL CO., 37-38 Hatton Garden, London, E.G. 



Telephone : Holborn 2640 ] 



Op through all Dealers. 



[Telegrams: "Optibalcp, London.' 



Trade Makk. 



JAMES SWIFT & SON, 



Optical and Scientific Instrument Makers, 



Contractors to all Scientific Departmenti of H.M, 

 GoT'trnnunt. 



Grands Prix, Diplomas of Honour, and Gold Medals at 

 London, Paris, Brussels, &c. 



THE "DISCOVERY" MICROSCOPE 



AS supplied to tlie Royal Society (or llie 



Antarctic Expedition, the Priticipal Science 



Colleges, and Medical Schools. 



Fitted with first quality | in. and \ in. 

 Objectives, Ocular and Iris Diapiiragm, 



In Cabinet, £6 : 15 : Oi 



Double Nosepiece and extra Ocular, 15 



N3. — All otu Miixoscopes (indading 

 the Lenses I are made in ooi own 

 workshops on the Premises. 



Cata'o^ue post free. 



UNIVERSITY OPTICAL WORKS, 



81, TOTTENHAM COIRT ROAD. LONDON. 



Microscope Slides. 



BOTANY - ZOOLOGY - GEOLOGY. 



LARGE STOCKS IN ALL BRANCHES. 



Slides prepared to order from Customers' own Material. 



See Catalogue "A,*' 40 pp. — Post Free to all parts. 



— PHOTOMICROGRAPHY. 



RECENTLY ISSUED NEW CATALOGUE. "B/la," 



Microscopes, Accessories, Reagents, and Apparatus generally. 



Post Free to Colleges, Schools, sad Regular Customers. 



FLATTERS & GARNETT, Ltd., 



309, OXFORD ROAD ('K^:^;,;r), MANCHESTER. 



THE 'WILSON' 



SELF-RECORDING 



(Electrical) W 



RAIN GAUGE. 



Records automatically 



on a Weekly Chart 



wherever desired inside 



the house. 



SELF-REGISTERING 



AND 



SELF-RECORDING 



(ELECTRICAL) 



RAIN 

 G AUGES . 



-«1 THE 'WILSON' 



SELF. REGISTERING 



RAIN GAUGE, 



With Improved Receiver to 

 prevent splashing. 



SOLE MAKERS: 



PASTOR ELLI & RAPKIN, Ltd. Ci%':) 



ACTUAL MAKERS OF ALL KINDS OF METEOROLOGICAL INSTRUMENTS, 

 Contractors to h.M. Government, 



46, Hatton Garden, London, E.G. 

 STANDARD INSTRUMENTS OF ALL KINDS. 



Illustrated Price List Post Free. 



*^* We pay carriage and guarantee safe delivery within U.K. on all our Instruments. 



Printed for the Proprietors (Knowledge Publishing Company, Limited), by John King, Ealing and Uxbridge. — March, 1915. 



