SCIENCE-ADVERTISEMENTS 



The new 



"Mamey" 



Motion Picture 



Projector 



for the cleissroom 



is practically dangerless, requires no 



special preparations — 



IS instantly attachable to any electric 



socket and available for all currents; 



no rheostat necessary 

 Supplement your lectures now with 

 modern, progressive and 

 interesting motion 

 pictures. 

 No feeding of carbons, hence continuous 

 film movement ; an even, steady, con- 

 stant light all the' time. 



PRICE: — Complete with two spools to take regular (1000 feet) lengths standard size film, lens ; 

 incandescent lamp, cord and plug, and total reflex screen of 56x56 in. size. Duty Free - $45.00 



Literature " S. P." from 



MEYER CAMERA & INSTRUMENT CO., INC. 



18 West 27th Street NEW YORK 



Importers and Dealers in SCIENTIFIC INSTRUMENTS 



WM. GAERTNER & CO. 



Astronomical and 

 Physical Apparatus 



SPECIALTIES 



Standard Apparatus of New and Improved Deaiffiu 

 Reading Microscopes and Telescopes 



Astronomical Telescopes 

 SpectriMcopes 

 Michelson Interferometers 

 Helxostats ^ 



5345 and 5349 Lake Ave. 



DiTiding Engines 



Comparators 



General Laboratory Apparatus 



Universal Laboratory Supports 



CHICAGO 



Portablo Equatorial Telescoptt widi 

 Driving Clock. 



Sanitats" Porcelain! 



(Registered Name) 

 from the Porcelain Works of 



W. HALDENWANQER, SPANDAU near BERLIN 



can be obtained from all dealers in chemical apparatus 



Please take notice 

 " Blue Arrow" 



i 



of my Trade- Mark 

 under the enamel 



