SCIENCE-ADVERTISEMENTS 



Important 

 Reduction in Price 



OF 



Staudinger Analytical 

 Balance no. 3 



Becanse of the new management and increased 

 manufacturing facilities in the factory in Ger- 

 many, we are now able to oiier the STAUD- 

 INGER ANALYTICAL BALANCE No. 3 at 

 the following prices : 



Price, duty free $32.00 net 



Price, from stock 50.00 net 



Capacity— 200 grams. 



Sensibility— regular adjustment is 1-5 mg. equals I 

 degree of scale. May be read to 1-10 mg. equals J^ 

 degree of scale. 



Case- of polished mahogany. 



Base— of polished black slate. 



Beam— of hard welded magnalium, highly polished, 

 13 cm. long. 



Knife Edges and Planes— of agate throughout. 



Release and Arrest — by means of a centrally located 

 milled head, half turn of which simultaneously re- 

 leases beam, hangers and pans. 



Rider Carriei — patented Staudinger construction, lift- 

 ing the rider yertically in a straight line. 



Pans— heavily platinum plated. 



Finish— with the exception of the pans which are 

 platinum plated and the magnalium beam, all 

 metal parts are lacquered in a dull black finish 

 particularly resistant to laboratory fumes. 



■ Send for complete descriptive pamphlet 



SOLE U. S. AGENTS 



ARTHUR H. THOMAS CO. 



IMPORTERS AND DEALERS 



MICROSCOPES, LABORATORY APPARATUS 

 AND CHEMICALS 



WEST WASHINGTON SQUARE 



PHILADELPHIA, PA. 



CUSSONS' 

 PATENT RIBBON 



^ 



Atwood's 

 Machine 



CUSSDNS . 



This new type of machine 

 has reinstated the importance 

 of Atwood's historic experi- 

 ment and made it possible for 

 students toobtain accurate and 

 instructive determinations. 



A graphic record of the ac- 

 celeration of a falling body is 

 made on a strip of paper. 

 From this is secured necessary 

 data for verifying many pro- 

 positions in Practical Physics. 

 The movement of one lever 

 sets the machine into operation 

 and eliminates all lag due to 

 magnetic or other releasing 

 devices. Mechanically the 

 machine is very well construc- 

 ted and because of this, 



together with its simplicity, most excellent results 



are easily secured and duplicated. 



For full details of construction, and instructions 

 for various experiments — 



Write for Illustrated Catalog 2M 



"Cussons" Capstan Block Apparatus is also a 

 very attractive outfit. With the standard set 

 twenty separate experiments in practical mech- 

 anics and experimental mechanics can be per- 

 formed. All interested in such equipment should 

 investigate this set. Write for Catalog 2 C 

 describing it, now. 



JAMES G. BIDDLE 



Sole U. S. Agent for "Cussons' Apparatus" 



1211-13 Arch Street 

 PHILADELPHIA 



When in Philadelphia be sure to visit our Permanent 

 Exhibit of Scientific Apparatus. 



