Page:Popular Science Monthly Volume 92.djvu/619

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���The sheet metal is curved is supported on the wagon

��Portable Brush Burner Carried on a Truck

THE accompanying illustration shows a labor-saving device which is used by fruit growers in a western valley. It is a portable brush burner used mostly in young o r- chards where there is less danger of damaging the overhanging branches. In older o r- chards, where J;he trees oc- cupy a larger space, it is customary to gather and haul the brush out of the orchard, to be burned. But this simple brush burner is a labor- saver in the young orchard where little pruning is needed. An ordinary brush pile burned on the ground spoils vegeta- tion and the ashes resulting from the fire have little value if left in a heap. The burner keeps the heat from the ground and the ashes may be strewn where needed.

It consists of a steel plate bent in a U-shape and supported on a truck with curved angle iron held above tho wood- work by metal braces. It saves hand- ling the brush several times, as the men can throw the brush on to the fire and save two haulings.

It costs about $2.50 an acre to handle brush with this device, and where a large acreage is to be cleared, this is less than it costs to use a team, and men hauling it out of the orchard. — Earle W. Gage.

��proportions. The holes back of the cartridges are filled with clay and tamped. One stick placed as shown in Fig. 1 will usually be sufficient to bring down a tree of less than l:j in. in diameter, while two sticks placed as shown in PMg. 2 will be enoueh for a tree under 19 in. in

diameter. Three sticks placed as in Fig. 3 will be required for a tree or timber under 23 m., and four sticks placed as in Fig. 4 \\\\\ bring down a tree 27 in. in di- ameter, or less. The charges should be fired simultaneously, but if firing must be done by time fuse it is often advisable to place one charge and e.xplode it; then place the second charge, and explode it; and so on.

If a timber is not over 12 in. in diam- eter and no boring tools are at hand it may be readily cut down by encircling it

��to hold the brush and truck with metal pieces

���It's Easy to Blast Trees or Timbers with Dynamite

IT is a very simple matter to blast al- most any kind of timber work with the aid of dynamite, without danger, if certain simple rules are followed. To blast trees or timbers a charge of i? lb. per square foot of sectional area is placed in holes in the same cross-section, which will be sufficient to cut off trees and round or square timbers of ordinary

��Wood Ff^'4- t^igS pile ^195

Various methods using ditterent numbers of sticks of dynamite for felling trees

with a chain of cartridges placed on the same plane as in Fig. 5. The ring must fit snugly against the wood and should be fired with primers on both sides. This method is also effective for piles and trestles under water. The cartridges may be secured to a ring or hoop as shown in Fig. 6 and slipped down into place. — George M. Petersen,

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