. American forestry. Forests and forestry. 518 AMERICAN FORESTRY. DliCK PLAN REPLACED BECAUSE OF DECAY. construction, as they reduce the number of gunwale joints to a minimum. The gunwale joints are always the first points to cause trouble by leaking, and so it is a big item to reduce these joints to a minimum. Besides being cheaper in cost, both before and after creo- soting, the fir is lighter, resulting in a draft of but 9 inches for a standard barge 100 ft. x 20 ft. x 4 ft. 7 in. White oak has been used almost ex- clusively in the past for the construc- tion of model-shape steamboat hulls.
. American forestry. Forests and forestry. 518 AMERICAN FORESTRY. DliCK PLAN REPLACED BECAUSE OF DECAY. construction, as they reduce the number of gunwale joints to a minimum. The gunwale joints are always the first points to cause trouble by leaking, and so it is a big item to reduce these joints to a minimum. Besides being cheaper in cost, both before and after creo- soting, the fir is lighter, resulting in a draft of but 9 inches for a standard barge 100 ft. x 20 ft. x 4 ft. 7 in. White oak has been used almost ex- clusively in the past for the construc- tion of model-shape steamboat hulls. The present tendency is to use steel. Cresoted timber is eliminated from consideration for model-type hulls on account of the necessity of framing and cutting timbers during erection, which would expose untreated surfaces if creosoted timbers were used. It is the opinion of the writer that the steel hull will give more economical results, for the reason that when the cost of re- pairs on an untreated oak hull during its life are added to the original cost, the yearly charge will closely approxi- mate that of a steel hull. These relations, however, do not ex- ist in the case of "scow" pattern boats and barges. A steel barge will cost more than three times as much as an untreated fir barge, and nearly three times as much as a creosoted barge. The lumber for these "scow" pattern boats and barges can be advantageously framed and bored before treatment. The first creosoted barges used in this country were built in 1900 of pressure treated yellow pine by the New Orleans Office of the U. S. Engineer Corps. These barges are today in a perfect state of preservation, and in all prob- ability will be used for 10 to 12 years longer. The cost of repairs has been light, and the results so satisfactory that no untreated barges are now built by that office. The Rock Island District formerly used the open-tank treatment. The penetration was usually superficial, but the cost
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
