KNOWLEDGE. 



February, 1915. 



NEW MODEL 



FS and FFS 



pauscK'lomb 

 MICROSCOPE 



WITH SAFETY SIDE FINE ADJUSTMENT. 



KEW ATTACHABLE MECHANICAL STAGE. No. 2116, £3 S 



We have sold over 100,000 Microscopes, which are in use all over the world. 



Inspection incited at our New Showrooms, or List "A.S. 2" sent post free. 



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. 



Trade Mark. 



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



Or through 

 all Dealers. 



JAMES SWIFT & SON, 



Optical and Scientific Instrument Makers, 



Cofiit-actoJS to all Scientific Pcpa> ti'rents c/ H.M. Gffft. 



Grands Prix, Diplomas of Honour, and Gold 

 Medals at London, Paris, Brussels, &c. 



NEW (( 



MODEL 



I.M.S.'MIGROSGOPE 



SPECIALLY DESIGNED FOR 

 BACTERIOLOGY AND HiEMATOLOGY. 



With Improved Fine Adjustment and Special 

 Mechanical Stage. 



Fitted with s-in., |-in., and 1'5-iii. (Oil Immersion) 

 ■^ Objectives, Oculars, Triple Dust-proof Nose-piece, 

 ^ Abbe Condenser, Ins Diaphragm. Mechanical Stage, 

 etc., in Cabinet. £23. 



N3. — All oar Microscopes (including 

 the Lenses) are made in oor own 

 workshops on the Premises. 



Catalogue Post Free. 



UNIVERSITY OPTICAL WORKS, 81, Tottenham Court Road, LONDON, W. 



Microscope Slides. 



BOTANY - ZOOLOGY - GEOLOGY^ 



LARGE STOCK IN ALL BRANCHES. 

 SELECTIONS SENT ON APPROVAL. 



Special Slides mounted to order from Customers' own Material. 



— PHOTOMICROGRAPHY. — 



CATALOGUE 



FREE ON APPLICATION. 



FLATTERS & GARNETT, Ltd., 



309, OXFORD ROAD ('SESi,';"), MANCHESTER. 



THE "PEANDAR" ELECTRIC 

 SELF-RECORDING ANEMOMETER 



Showing inside the 

 house (from any dis- 

 tance), on the dial, the 

 total miles of wind 

 passed, and on the chart 

 a weehly record of the 

 periodical variations. 



Special contacts have 

 been devised which pre- 

 vent the current being 

 left on at any time. 



PRICE COMPLETE, 

 with wire, batteries, 

 ink, and charts lor a 

 year, in baodsome 

 oak, mahosany, or 

 walant case, with 

 bevelled plate glasses, 



£22 



Easily Fixed by 

 any Mechanic. 



M-- PASTORELLI & RAPKIN, LTD., "- 



Contractors to H.M. Government, 



46, HATTOM OARDEM, LONDON, B.C. 



ACTUAL MAKERS OF ALL KINDS OF METEOROLOGICAL INSTRUMENTS. 



IV Wri^e for Illustrated Descriptive Lists of Standard, Self-Registering, and Self- 



Recoiding Instroments, 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.— February, 1915. 



