Canadian Forestry Journal, Januarij, 1917 



929 



Fuel Value of Wood vs. Coal 



The fuel value of 2 pounds of wood 

 is roughly equivalent to that of 1 

 pound of coal. This is given as the 

 result of certain calculations now 

 being made in the Forest Service 

 laboratory, which show also about 

 how many cords of certain kinds of 

 wood are required to obtain an am- 

 ount of heat equal to that in a ton of 

 coal. 



Certain kinds of wood, such as 

 hickory, oak, beech, birch, hard ma- 

 ple, ash, elm, locust, longleaf pine, 

 and cherry, have fairly high heat 

 values and only one cord of seasoned 

 wood of these species is required to 

 equal one ton of good coal. 



It takes a cord and a half of short- 

 leaf pine, hemlock, red gum, Douglas 

 fir, sycamore, and soft maple to equal 

 a ton of coal, and two cords of cedar, 

 redwood, poplar, catalpa, Norway 

 pine, cypress, basswood, spruce and 

 white pine. 



Equal weights of dry, non-resinous 

 woods, however, are said to have 

 practically the same heat value re- 

 gardless of species, and as a con- 

 sequence it can be stated as a gen- 

 eral proposition that the heavier the 

 wood the more heat to the cord. 

 Weight for weight, however, there is 

 very little difference between various 

 species; the average heat for all that 

 have been calculated is 4,600 calories, 

 or heart units, per kilogram. A kilo- 

 gram of resin will develop 9,400 heat 

 units, or about twice the average for 

 wood. As a consequence, resinous 

 woods have a greater heat value per 

 pound than non-resinous woods, and 

 this increased value varies, of course, 

 with the resin content. 



The available heat value of a cord 



— .4. 



Dry Matches 



After all day in a 

 boat, rainstorm, 

 or wet snow. Ask 

 your dealer for 

 WATERPROOF 

 MATCH BOX 

 If he can't supply you, we will send prepaid 

 for his name and 50 cents. Dry matches 

 may save your life. 

 MARBLE ARMS MFG. Co. 

 Dept. 5160 Gladstone, Mich., U. S. A. 



MaRbijs 



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