26 



Hardwood Record — Veneer & Panel Section 



June 10, 1919 



PLYWOOD 



Ftir Makers of 



FURNITURE 

 CABINETS, CHAIRS 

 TABLES, DESKS 

 TRUNKS 

 MOTOR TRUCKS 

 FILING CABINETS 

 INTERIOR TRIM & 

 FIXTURES 



Made of 



QUARTERED OAK 

 MAHOGANY 

 BLACK WALNUT 

 QUARTERED GUM 

 PLAIN RED GUM 

 PLAIN OAK 

 ASH, BIRCH, ELM 

 BASSWOOD & MAPLE 



Flat or Bent Work Machined or in Panels, With 

 or Without Part Cabinet Work Finished or in the White 



Send Us Your Specifications 



WISCONSIN CABINET & PANEL COMPANY 



NEW LONDON, WISCONSIN 



iCoiiiiimcd from pat/r 24) 



to produce failure very early after the maximum load was 

 passed. 



Suitable Drying Conditions 



The accompanying curves give the temperatures and 

 humidities suitable for kiln-drying airplane material with- 

 out injury. The length of time shown is only intended 

 as approximate, as it will vary greatly in different kilns. 



In these curves the temperature is in degrees Fahren- 

 heit of the hottest portion of the pile of lumber. The 

 relative humidity and the moisture percentage of por- 

 tions of lumber subjected to these same conditions are 

 also given. It is not intended that these curves should 

 represent the continuous conditions at all times, as it 

 would ordinarily be entirely impracticable to follow a 

 smooth curve in the regulation of a dry kiln; but they 

 represent the maximum temperatures and minimum hu- 

 midities which should prevail for any considerable time, 

 and a condition which should be approached as nearly 

 as possible. Milder conditions are permissible, but not 

 more severe. Steaming in saturated steam at the begin- 

 ning of the drying with a temperature not more than 1 5" 

 F. higher than the initial drying temperature, and com- 

 bining 6 hours for every inch in thickness, is permissible 

 and usually desirable for green wood; for previously 

 air-dried wood, 8 hours for every inch of thickness may 

 be allowed, with a temperature not over 30 higher than 

 the initial drying temperature. Near the end of the run, 

 the material, if casehardened, should be steamed for 



not more than 3 hours, in saturated steam at a tempera- 

 ture 20° higher than the final drying temperature. After 

 steaming the normal drying conditions should be resumed, 

 and the excess moisture added by the steaming should 

 be removed from the lumber. An average dryness of 

 8 per cent, with an individual variation of from 5 to 1 i 

 per cent, is ordinarily required. 



For details as to measurments of conditions in dry 

 kilns and tests of the lumber, reference is made to Signal 

 Corps Specification 2 0,5 00- A. 



Gluing Very Thin Veneers 



Makers of furniture, musical instruments, and interior house 

 finish who use very thin veneers, particularly crotch mahogany, 

 frequently experience trouble in holding the thin sheets flat after 

 the glue has been applied or before the sheets are laid ready for 

 the press. The glue's dan\pness causes the veneer to roll and 

 warp before the sheet can be placed. 



Experiments to overcome this handicap have been successful to 

 a large extent. The glue is spread, not directly on the veneer, but 

 on both sides of tissue paper and the paper is then placed between 

 the sheets to be glued. In that way the sheets are satisfactorily 

 glued together, without curbing, and after the work has been 

 done, the presence of the tissue paper is not objectionable. 



The field where this method can be applied is belie\'ed to be 

 large, but it is particularly recommended for crotch mahogany. 

 This valuable wood is nearly always cut in very thin sheets, and 

 it is inclined to roll badly, because of the various directions of the 

 fibers. Spanish cedar used in veneering cigarbox lumber is gen- 

 erally cut very thin, and the employment of tissue paper in laying 

 the veneer ought to assist in securing satisfactory results. 



