October, 1910. 



KNOWLEDGE. 



Watsons Microscopes. 



British made at Barnet, Herts, with 5 years' guarantee. 



The long evenings will soon be with us and a really attractive 



and intelligent hobbv or means of recreation is wunted hv nianv. 



Have you ever tried a WATSONS' MICROSCOPE? 



Vou have scientilic tastes and inclinaiions or you woulii not 

 read Kn^nvUdge. A Microscope is an ideal means of developing 

 such. The wealth of inlormatic-n it reveals, the new world it 

 discloses, the never ending subjects which can be examined, 

 together with the comfortable use of it at the fireside render it 

 unequalled for home use. 



Watsons make more than 20 different Models 



At varying prices. They are noted for their permanent working 

 quality, and convenience of design. 



fit is important that a Microscope Stand is selected to which 

 additions can be made as required. 



Watsons' "F " Edinburgh 

 Student's Microscope 



iurui> All arlmiial-lc ba<.e for future 

 additions. It is a stand of the highest 

 class that alwaj's gives pleasure and 

 satisfaction. 



It is of convenient size, has very rigid 

 tripod ftxit. Watsons' Standard Lever 

 Fine Adjustment ; Diagonal Rackwork 

 for Coarse Adjustment. Large stage, 

 covered Ebonite. 



PRICE. 



Maho^aiiy Case 



STAND "F" completely 

 fitted with Eyepiece, \" 

 and 1/6" Parachromatic Ob- 

 jectives, in Mahogany Case 



£o 7 6 

 I 



8 7 6 



■ F ■■ Ed. Student's MicROScorE, 



WITH COMPOCSD SlBSTAGE. 



Compound Substage and Mechanical 



Stage can be added at any time. 



Full particulars of Watsons' Hlcroscopes are ^iven in their 168 page 



Catalogae of Microscopes (2K). which with their booklet. " The choice 



of a Microscope." will be sent free on reqaest. 



ASTRONOMICAL TELESCOPES. 



All intL-resied in Ajtr'jiiomy should send for Watsons' Catalogue 

 (6K) which gives inlurmation ahout iheir instruments and the 

 celehrated Watson-Conrady Objectives, post free on request. 



Watsons' Instruments may be purchased by progressive payments. 



SECOND-HAND 

 ASTRONOMICAL TELESCOPES. 



A list of Second-hand Telescopes Is Issued monthly. A cop; will be 

 sent on applicailOD. 



6 inch Equatorial by G>ub!\ with Clockwork 

 on Iron Column. Electric Illumination to 

 Verniers, Telescope for Vernier from Eve 

 End; original cosi, £290. In fine condition 



4 inch Equatorial by Cooke &= Sons, on stout 

 Tripod Stand, with Struts. lA inch Finder, 

 4 Astronomical and Solar and Fancratic Eye- 

 pieces, Clamps and Slow Motions; complete 

 with Packing Cases Cost £77 10s. Od. Price 



24 inch Reflector Telescope by Grjiifi, Equa- 

 torial Stand, Electrically controlled Clock. 

 Fitted with 6 inch Finder Telescope. Cost 

 £650 Price 



8J inch Reflector Telescope, with 2 Finders, 

 Equatorial Mounting and Iron Stand. The 

 Mirror has recently been re-worked and the 

 performance is guaranteed. A bargain 



£185 



£50 



£375 



£35 



For full particulars of the above, also o/ntanv others, -with sundry accessories 



and flitings. apfly to 



W. WATSON & SONS, L" 



(Established 1S37). 



313, HIGH HOLBORN, LONDON, W.C. 



Works: BARNET, HERTS. 



Branch: 16, FORREST ROAD, EDINBURGH. 



n.,nf.- i2- Easv Row, BIRMINGHAH. 



uepois. -^jg^ Swanslon Street, .VIELBOLRNE, AISTRALU. 



DENT'S CLOCKS 



WATCHES AND CHRONOMETERS 



FOR SCIENTIFIC LSt^ 



Sidereal or Mean Time Clocks for 

 Observatories, £21 and upwards. 



THREE GRAND PRIZES 

 AM ONE GOLD MEDAL 



FRANCO-BRITISH EXHIBITION. 



The only Grand Prize awarded 

 to a British Firm for Watches, 

 Clocks and Chronometers. 



The only Grand Prize awarded 

 for Astronomical Regulators. 

 Chronographs, and Ship's 



Compasses. 



TRADE MARK. 



61, STRAND, and 4, ROYAL EXCHANGE, LONDON. 



Telephone \o. 61 City 



V< 'T ("AN ( )|-;T.\IN A 



SATISFACTORY TYPEWRITER 



For £5. 



All .Makes— over 200 .Machines to Select from. 



Call or Write . . . 



THE WHOLESALE TYPEWRITER Co., Ltd., 



22, GRAY'S INN ROAD, W.C. (Eleven Doors from Hoi. orn . 

 COPYING AND DUPLICATING AT SPECIAL PRICES. 



BEST 

 COCOA 



EARTH 



GUARANTEED ABSOLUTELY PURE SOLUBLE COCQA ONLY 



