June 22, 1905] 



NA TURE 



SPECTROSCOPE 



(COwrsTJ*.*iT i>e:'vij*.tion). 



The special advantages of this Spectroscope arc — the Collimator 

 and Telescope ate fixed at right angles, thus the instrument will 

 stand in a corner, and is alwui/s ready for use 

 and in adjustment. 



The Prism is of the now well known CONSTANT 

 DEVIATION type. 

 Reads in Wave-lengths Direct and with Great Accuracy. 



"No. 5" 



SPECTROMETER. 



Designed with special 

 reference to 



STANDARD ANGULAR 

 MEASUREMENTS. 



ILLUSTRATED LIST OF SPECTROSCOPES AND 



SPECTROSCOPIC ACCESSORIES FREE UPON 



APPLICATION. 



AJyAT^ HILGER, Ltd 



GOLD MEDAL AWARDED, 



, 75a Camden Road, London, N.W. 



ST. LOUIS EXHIBITION, 1904. 





All other air 

 pumps superseded. 



THE. 



it 



GERYK 



9f 



{Fleuss Patent) 



Vacuum Pump. 



R^esults hitherto only pos- 

 sible with mercury pumps 

 are readily obtainable by 

 the " GeryK." Used by 

 all leading scientists. Far 

 more rapid than any other 



vacuum pump. 

 Price from Write for 



£4:5:0. LIST F.45. 



pulsotneter engineering GSXi 



• Qin« etm» Ironworhs. Reading^ 



AWARDED MEDALS WHEREVER EXHIBITED, 



including q at the great Paris Exposition of 190D. 



JAS.J. HICKS, 



WHOLESALE MANUFACTURER OF 

 SCIENTIFIC AND CHEMICAL APPARATUS 



WAR OFFICE, INDIA OFFICE, ADMIRALTY, 



ROYAL COLLEGE OF SCIENCE (LONDONi, 



GOVERNMENT LABORATORY, 



MANCHESTER SCHOOL OF TECHNOLOGY, &C., &c. 



Selected and 



used for the 

 official records 



on boai'd the 

 Antarctic ship 



•' Discovery." 



CAMPBELL-STOKES SUNSHINE RECORDER, 



WITH CURTIS'S IMPROVEMENTS, 



as supplied to the Meteorological Office for their Standard Pattern. 



ANY KIND OF SCIENTIFIC INSTRUMENT MADE TO ORDER. 



Prompt Attention to all Orders and Inquiries, 



m- EXCEPTIONAL TERMS TO COLLEGES, INSTITUTIONS, &C. 



,-)„atal,o„i: si^tm/tU./ /'"'■/-''■"'■'-'"•'■}' 0«i/ils or Single /nstrn,, 



" THERMOMETERS FOR STUDENT WORK A SPECIALITY. 



Catalogues Post Free. (S 



8. 9. 



& 10 HATTON GARDEN, LONDO 



J 



