ih'^'r^l 



SCIENCE 



New Sbkies. 

 Vol. VII. No. 159. 



Friday, January 14, 1898. 



Single Copies, 15 CTS. 

 Annual Subsceiption, 55.00. 



AMPERE'S LAW APPARATUS. 



New Physical Apparatus. 



We have just issued a catalogue of new Physical Apparatus describing among others the following pieces: 

 Apparatus for Demonstrating the Laws of Mechanics, Inclined Plane Apparatus, Bending of Beams, Breaking 

 Strength of Wire, Torsion Pendulum, Coefiicient of Expansion Apparatus, Optical Bench, Electrical Gyro- 

 scope, Ampere's Law Apparatus, etc. Most of these pieces are for students' laboratory use, a few are for 

 demonstrations ; all are of new and original design. Write for Catalogue No. 275. 



IN PRESS. 



A New Catalogue of 

 Physical Laboratory Supplies. 



This is not a catalogue of instruments but its 175 pages are devoted entirely to supplies and general 

 laboratory fittings such as wire, batteries, beakers, burners, connectors, binding posts, thermometers, lenses, 

 mirrors, etc., etc. It is a much more complete index to our extensive stock than we have before been able 

 to place before the public. As it is alphabetically arranged, it is very easily referred to. A copy should be 

 in every Physical Laboratory. It will be sent on request to teachers of Physics. 



Queen & Co., incorporated, 



1010 Chestnut Street, 



NEW YORK OFFICE: 



116 FULTON STREET. 



Philadelphia. 



