^ 



\J l^ ^ • 



SCIENCE 



New Series 



Vol. LVI, No. 1439 



Friday, July 28, 1922 



Annual Subscription, $6.00 

 Single Copies, 15 Cts. 



Bingham & Green Variable Pressure Plastometer 

 With Freas Water Thermostat as Bath 



book 



by Dr. E. C. Bingham, entitled 

 'Fluidity and Plasticity." 



The shearing force required to start the flow 

 is known as the Friction of the material. The 

 rate of flow after the friction has been ex- 

 ct'cdcd gives a measure of the Mobility of 

 the material. The Plasticity of a substance 

 is therefore .determined by these two readily 

 measurable properties. 



The Bin£;h£un & Green Plastometer is the 



standard instrument for determining plas- 

 ticity as above indicated. It consists of a 

 source of air pressure with tank and pres- 

 sure regulator for preliminary regulation, and 

 a mercury stabilizer for exact regulation, a 

 mercury gauge for measuring the pressure, 

 a bath in which the plastometer proper is 

 immersed to control the temperature, and the 

 plastometer proper. The plastometer proper 

 is a brass container for the material. The 

 cover has a tube for connecting with the air 

 pressure. At the bottom of the plastometer 

 a glass capillary tube of size as desired is 

 inserted. There is also a side tube extending 

 upward for the escape of air. The amount 

 of pressure required to start the flow is 

 noted, also the amount of material extruded 

 in a given time at a given pressure. 



The Bingham & Gi 



ommended for th 

 of plastic: 

 tically all 



;erH&..rec- 



thei^^orv ^:p|iarol laf ^I'lloiM^ 

 udmajjlknits, clays and ^i;^- 

 a(^la^^'' in the colloid state. ^'/^ 



Je 



AMONGST USERS ARE THE FOLLOWI 



Washington, D. C. Texas Company 



Iso ased for reseai 

 nd other villus njJiHals' 



.,-. — , 7 Jersey. 



SM/nford, Connecticut. ilS^ ^ 



■^ 



3ayonne, New Jersey. 



of Standa 



sey Zinc Company, Palmerton, Pa. Richards CompanJ 



Lafayette College, Easton, Pennsylv ' 



PRICES OF DISTINCTIVE PARTS 



Mercury Stabilizer, including mercury gauge ^ $150.00 



Plastometer proper with four (4) capillaries 60.00 



Write for further details. 



iTiEnd 



IS5 I 



NEW YORK CITY 



PITTSBURGH BRANCH 

 3rd Ave., 18th — 19th St. ^<£_J^ 4048 Jenkins Arcade 



ESTABLISHED 1851 



Headqucirters for Laboratory Apparatus and ChemiceJ Reagents 



Washington, D. C. Display Room, Suite 601, Evening Star Building, Pennsylv 



Avenue and 11th Street. 



