Jo 5. 



SCIENCE 



New Series. 



Vol. VIII. No. 193 



Friday, September 9, 1898. 



Single Copies, 15 CTS. 

 Annual Subsckiption, $5.00 



■Wiirling Table. 



C athetometer. 



Parallelogram of Forces. 



New Physical Apparatus for 

 Demonstration, Research and Laboratory Practice. 



Our new edition of Cat. I., now in press, describes and illustrates the most complete line of Physical 

 Apparatus for both Lecture Room and Laboratory that we have ever published. It includes apparatus for 

 use in Physical Optics and Students' Electrical Measuring heretofore listed separately. It, together with our 

 new Catalogue of Physical Laboratory SUPPLIES, should be in the hands of every teacher of Physics. 

 Write for it. =^^=^^^ 



Queen & Co., inc , 



....optical and Scieiiti£c Instrument Works.... 



New York Branch; 59 Fifth Ave. IQIO CHESTNUT ST., PHILADELPHIA. 



