46 



Hardwood Record — Veneer & Panel Section 



August 10. 1921 



TABLE GLU 



TIw Picture Shozvs the Present Home of 



PERKMS 



TRADE MARK j]^ ^^3 "*'^ ^'' ^ ''*' '^^'^ 



Our progress lias l)eeii made ])ossiI}le l)ecause the iiiainritv of the glue using trade was 

 alive to the o])portunity of PERKINS OUAI.rr\' and I M'IK Kl XS SERVICE. 



Process and i'loihict Patents covering Perkins Glue were granted July .'ml and March lyth, 1912, and have been held valid and 

 ^ulringed by the United States Circuit Court of Appeals. Patents have also been granted in Canada, Great Britain. Germany, 

 France. Belgium. Italy and other foreign countries. 



PERKINS GLUE COMPANY 



Factory and Gen. Offices: LANSU.AI.K, P.\. 



Sales Office: SOUTH BEND, INDIANA 



YOU WILL not 

 appreciate the 

 Mengel grade and 

 the Mengel serv- 

 ice until you have 

 tried "something 

 just as good." But 

 will you not take 

 our Word for it? 



^ipj 



INCORPORATED 



Louisville. Ky. 

 THE PAST AND PRESENT IN MAHOGANY 



\ Contiiiurd pom pogc 4^ i 

 or two to induce circulation. The size and location of such 

 ventilators is given slight consideration, except that they are made 

 large enough to handle a sufficient volume of air. Thus one often 

 finds large open air-ducts under the pipes, and large open ventilators 

 in the roof or upper walls. The result is that an excessive quantity 

 of steam is required to maintain an adequate temperature, for 

 too great a quantity of cold air is taken in and too much warm 

 air is allowed to escape. I have been in kilns where a few holes 

 in the roof, and similar holes under the pipes, was the method of 

 ventilation adopted. 



The question of ventilation is a rather involved one, for not 

 only must an adequate circulation be secured, but it should be 

 secured with a minimum loss of heat. The size, location, type 

 and control of ventilators and air-ducts must be given careful 

 consideration. 



Another important feature in kiln construction is the type and 

 fit of the doors. The ideal door is a tight-fitting, solidly constructed, 

 three-ply wooden door, hung on smooth-running carriers. A door 

 of this type is heat-proof, in that little, if any, heat escapes through 

 the joints, and it may be opened quickly and rolled out of the 

 way. The canvas curtain, however, seems to find favor in many 

 localities. A good double canvas curtain, held in place by battens, 

 makes a very satisfactory door, but a large quantity of heat will 

 escape through a single-ply curtain or a light, loosely-fitting wooden 

 door. Single-ply curtains are often found w^ith holes and rents, 

 which cannot help but reduce the temperature of the kiln; this 

 indicates carelessness and inefficiency. A person might as well 

 throw a few dollars away each day as continue to operate a kiln 

 with poorly-fitting, leaky doors or curtains. 



Another drawback encountered with poor doors and badly- 

 designed, poorly-located ventilators, is that to a certain extent the 

 control of the kiln is taken out of the hands of the operator. He 

 {Cotitinucd ftn iiage 48) 



