LABORATORY SUPPLIES AND CHEMICALS 



PAPER TESTING APPARATUS 



35S5 



3586 



3385 PAPER TESTER, Mullen type, for testing the strength of paper, fiber-board 

 and textiles. This instrument accurately and automatically registers the 

 strength of paper in pounds to the square inch. The paper is clamped 

 over one end of the cylinder which is filled with liquid. The liquid in 

 this cylinder is compressed by means of turning a handwheel and the fluid 

 is forced up against the paper. This fluid pressure is increased until the 

 paper is burst. At the breaking point the gauge pointer remains sta- 

 tionary, so the results can be read closely. Pressing on a button releases 

 the pointer. Besides its use on all kinds of paper, fiber-board and so 

 forth, the tester is used on such materials as leather, celluloid, textile 

 goods, etc. The regular size tester is fitted with a gauge to register up 

 to 160 pounds per square inch, although it is advisable to use lower 

 reading gauges for such materials as tissue or .newspaper and a higher 

 reading instrument for. boxboards and textile goods of all sorts. 

 Paper Tester, Mullen type $100.00 



3586 PRESSURE BULKER, Perkins' type. This instrument fills a very definite need 

 by providing a positive uniform standard for measuring the bulk of paper. 

 A pile of sheets is placed between the contact faces and the handwheel 

 clamp is screwed down until the desired pressure is indicated on the 

 dial. The thickness can be read directly from the vertical scale at the 

 left. The pressure is indicated in pounds per square inch and the thickness 

 in inches and fractions of an inch. The present and faulty method is 

 to caliper one sheet and multiply by the number of sheets in a pile or 

 package. This plan affords numerous errors, as the thickness of the 

 paper varies so much that' it is impossible to obtain a representative sheet 

 Pressure Bulker, Perkins' type On application 



We have the facilities for furnishing the latest types of paper and other testing 

 machines and do not purposely list at this time such instruments which are imported 

 and which are unobtainable at this period. However, upon the return of normal 

 conditions, we can furnish any of the imported high grade testing machines. 



