. Lumbering in the sugar and yellow pine region of California . ingengines have steam frictions on the main drum. A spool or smallfriction drum may be attached to the shaft of the main drum forloading purposes. The boilers are upright, ranging in size from 48 inches in diameterand 118 inches in height to 72 inches in diameter and 144 inches inheight. Some of the newer types have so-called extension fire boxeswhich give larger firing space. The boilers of the older types ofengines carry about 160 or 165 pounds of steam. The newer typescarry from 175 to 200 pounds. It is important in any yarder
. Lumbering in the sugar and yellow pine region of California . ingengines have steam frictions on the main drum. A spool or smallfriction drum may be attached to the shaft of the main drum forloading purposes. The boilers are upright, ranging in size from 48 inches in diameterand 118 inches in height to 72 inches in diameter and 144 inches inheight. Some of the newer types have so-called extension fire boxeswhich give larger firing space. The boilers of the older types ofengines carry about 160 or 165 pounds of steam. The newer typescarry from 175 to 200 pounds. It is important in any yarder to havesufficient boiler space to keep up steam pressure, especially in themornings or after showers, when the fuel is wet. Small machines, such as 10 by 11 inch tandem drum yarders, and9| by 10 inch and 9 by 10J inch compound yarders, are used in theyellow pine stands on the east side of the Sierras. Light, rapid ma-chines which can be readily moved are required because the timberis small and the stand open. Machines of these sizes are usually sup- Plate Fig. 1.—A 12 by 14 Yarder at a Railroad Landing in the Sugar Pine yarded in long lengths and bucked in chute. Separate loading engine below track.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlumbering, bookyear19
