. Bulletin (Pennsylvania Department of Forestry), no. 8-9. Forests and forestry. 106 Litter and Straw Carrier Parts. Sugar maple. White oak. Yellow poplar. Neck Yokes. Hickory. White oak. Beech. Threshing machines, including grain threshers and clover hullers. are the most important commodities of this industry, and in this particu ar line of manufacture Pennsylvania leads all other states. There are many interior parts of these machines that require woods of different qualities. The general tendency to substitute metal for wood has not proved practical and consequently a majority of these par
. Bulletin (Pennsylvania Department of Forestry), no. 8-9. Forests and forestry. 106 Litter and Straw Carrier Parts. Sugar maple. White oak. Yellow poplar. Neck Yokes. Hickory. White oak. Beech. Threshing machines, including grain threshers and clover hullers. are the most important commodities of this industry, and in this particu ar line of manufacture Pennsylvania leads all other states. There are many interior parts of these machines that require woods of different qualities. The general tendency to substitute metal for wood has not proved practical and consequently a majority of these parts like grain registers, dust conveyors, and screen frames are still made largely of wood. Likely for the same rea- son frames and siding or exterior panels of threshers call for wood and white pine and yellow poplar are the principal panel woods because these woods are light, easily worked, take paint readily, and are not given to twist and check. ^ ^ . , . Straw-carriers, closely allied to threshers, are another product important in this industry in Pennsylvania. Woods similar to those for threshers are demanded; white oak, yellow poplar, and sugar maple in the order named being most frequently called for. â , ». Corn shellers and land rollers demand a considerable amount of lumber each year. Beech for framing, shortleaf pine, and yellow poplar for panels play an important part in making the former, and sugar maple and oak for the latter. The rollers of land rollers were formerly made of wood. A cross-section from a sycamore or yellow poplar log was usually selected and the rollers were usually made on the farm or at nearby blacksmith shops. Today these implements are in universal use and have been found indis- pensable, as a labor saver. The factories sometime ago began making them and now use metal almost entirely, but a small amount of wood is still in use and hard maple meets the demand in the State. The bottoms of the roller platforms are of shortleaf pine but any st
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