42 



Hardwood Record — Veneer & Panel Section 



August 25, 1922 



Specialists in 

 /DIFFICULT ITEMSN 



We Manufacture 



ROTARY CUT VENEERS 

 THIN LUMBER SPECIALTIES 



BIRCH DOOR STOCK 

 MAPLE PIANO PIN BLOCKS 



YEARS or EXPERIENCE BEHIND OUR PRODUCTS 



\MUNISING WOODENWARE CO./ 



MUNISING, MICHIGAN 



Rotary Cut 



NORTHERN 

 VENEERS 



Maple Flooring 

 Mfrs.' Assn. 



pURNITURE manufactnrers and factory buyern who insist on 

 having: hiph quality veneers nhouhl seud us their orders. We 

 are specialists in Northern A'eneers, We also maJiufacture 

 Northern Pine, Spruce, Hemlock, Cedar Tosts and Poles, lAth 

 and Shingles, nhtch we ship in straight cars and cargoes or 

 mixed with our "Peerless Brand" Rook Maple, Beech or Bir<'h 

 Flooring. 



GET OUR PRICES 



The Northwestern Cooperage & Lumber Company 



CHICAGO OFFICES: 

 812 Monadnock Block 



Gladstone, Michigan 



' iJ f --7? THE HANDWRITING ON THE WALL f -^^^=-~=Tnr 



U^ 



! A 



V 



/ 



rite for "CASCO" U/I^M^^^lkl/if^i 



ed Book, a manual ^^>;?vi*>i^L ^iT 1 

 . Veneers. Panel- )f^\\ \\\\\ 



aking and Glue. \ \ ' ' 1 \ 



Samples of 

 "CASCO"" 

 on request 



THE CASEIN MANUFACTURING CO. 



Largest and Longest Established Manufacturers 



of Casein Products in America 



IS PARK ROW NEW YORK CITY 



Branch Oflices in Principal Cities 



tt'ouf luiril from ititgc :!()) 



divided by the area of the panel in square inches gives the 

 pressure secured on the panel in pounds per square inch. 



The pressure gauge reading must, therefore, vary with 

 the size of the panels if the same amount of pressure per 

 square inch is to be secured. For example, if the same 

 gauge pressure is applied on panels 1 by 36 inches as 

 on others 36 by 40 inches the pressure will be approx- 

 imately four times as great per square inch in the first 

 case as in the second. 



From the considerations above the foUow^ing formulas 

 for the calculation of pressures are derived: 



(2)* 



P' 



A' 



Where P = gauge pressure in pounds per square inch. 

 P' = pressure on panels in pounds per square 



inch. 

 A =^ area of piston or ram in square inches. 

 A' = area of panel in square inches. 



To illustrate the use of the formulas let the following 

 case be assumed : On a hydraulic press v/ith I 0-inch pis- 

 ton what pressure gauge reading is necessary to secure 75 

 pounds per square inch on panels 24 by 48 inches. Use 

 formula ( I ) : 



P' X A' 



Here P = gauge reading required 

 P'=75 



A' = 24 X 48 or 1 1 52 (area of panel) 

 A = 3.1416 X 5= or 78.54, the area of the piston* 

 75 X II52 



Thus P = or II 00 the required gauge 



78.54 reading. 



Suppose the operator of the press should use the same 

 gauge reading of I I GO pounds in pressing panels 8 by 36 

 inches, what would be the pressure on the panels in pounds 

 per square inch? 



*To iU:tcrmine accuraithi the cj-act pressure secured the weight of the 

 jilntcii to trhich the pressure is applied must be taken into consideration, 

 for prarlieal purposes, however it may he omitted from the calculation, 

 as inaccuracies in the gauge reading, etc., may account for iniich larger 

 errors. When the weight of the platen ia taken into consideration the 

 formulas become: 



(■V 



P X A W 



P' ^ minus or plus 



.4 • . I ■ 



(V 



Where W = weight of the lower platen plus weight of panels or upper platen 

 alone, as the case may he. The sign of the last member of equation (S) is 

 plus when the pressure is applied by the lower platcti and minus when ap- 

 plied by the upper. In equation (li) the reverse is true. 



*Thr area of a circle is equal to S.VilG times the square of the radius. 

 (Continued on page 44) 



