38 



Hardwood Record — Veneer & Panel Section 



September 25, 1921 



■American Walnut 



We manufacture both lumber and veneers 

 from selected logs grown in the famous 

 Iowa walnut district. The result is our 

 product possesses unusual merit, being 

 favored by Nature with a most beautiful 

 grain and color. We will appreciate a list 

 of your needs in both lumber and veneers 

 of walnut. 



DES MOINES 



10th and Murphy Streets 



SAWMILL CO. 



Des Moines, Iowa 



P V RNRRRS A Nl^ P ANHI S 



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GREY ELM 

 vMAPLE 

 \SSWOOD 



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'^■' ' ' '%i:>COfNMiN, vENEER^'GO: 





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Casein Glues Originated with the Romans 



"The use of casein as a basis for glue originated in the Roman 

 Empire many centuries ago, and continued to a greater or lesser 

 degree in European countries to the present day, " Lawrence Ot- 

 tinger, a representative of the Casein Manufacturing Company, 

 makers of "Casco" waterproof glue, told the Trunk & Bag Man- 

 ufacturers Association at a meeting at the Hotel La Salle in Chi- 

 cago, September 20. "Many veneered products made with casein 

 glue and dating back centuries, are intact today. An interesting 

 collection of data of this kind is now compiled and will be shortly 

 published by the Plywood Manufacturers Association in connection 

 with its publicity campaign. But the modern casein glues are 

 infinitely superior and are the result of years of scientific research." 



Discussing the waterproof qualities of casein glue Mr. Ottinger 

 said: "A glue must be elastic, otherwise it would be a cement. 

 in order to glue two or more pieces of wood together and then 

 soak or boil them without separation, it is necessary that the glue 

 soften under the water, so as to expand and contract with the 

 veneer?, yet retaining sufficient strength to hold them together. 

 If this were not the case, the wood would pull itself apart, just 

 leaving the fibre, which is the result if wood is put together w^ith 

 Portland cement. Thus when we say a glue is waterproof we mean 

 that it is insoluble, that is. that it will not dissolve, yet will soften 

 under water, and it will hold together all constructions of a nature 

 such that the co-efJicient of the expansion of the veneers is no 

 greater than the strength of the glue in its soaked condition. Thus 

 a 3/16" panel made up of three plies of 1/16" veneer will stand 

 soaking indefinitely, whereas a %" panel made of the same wood 

 and the same glue will separate if boiled or immersed for a sufficient 

 length of time. Again a hard veneer, such as birch, having a 

 greater expansive strength, will not hold under water for as long 

 a time as veneer of a softer woodj such as basswood or poplar." 



