8CIENCE-ADVET{TfSEMENT8 



are sold in competition 

 with instruments of 

 European make to many 

 of the best laboratories 

 throughout the world. 



New Student's 



Spectrometer 



Send for Catalog and further details. 



I 



rsical and Astronomical Instnimeiifs 



S34S-4-9 Lake Ave. 



The "Atwood's Machine" 



The Patented Ribbon Atwood's Machine ehcnn in the illui-tiation 



is a new form, and furnishes an excellent means of illustrating the 



laws of falling bodies. A graphic record of the fall is made on the 



paper strip, connecting the weights. The motion of a single lever 



allows the weight to drop, and sets the pendulum in vibration. With 



the use of this machine, results are obtained which cannot be approached 



in accuracy by any other apparatus. 



Other Cussons products which have met with wide-spread approval are 

 the Mathematical Models, Capstan Block Apparatus, Machine and Steam 

 Engine Models, and Apparatus for Experimental Mechanics, catalogs of 

 which, with attractive "Duty Free " price, will be sent on request. 



JAMES G. BfDDLE 



SOLE U. S. AGENT . , 



1211-13 Arch Street PHILADELPHIA 



When in Philadelphia be sure to visit our Permnnent Exhibit of Scif nlific Irstiumenis. 



