Increasing demands for timber in nineteenth-century America transformed lumbering in the Great Lakes region.
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In nineteenth-century America, practically everything that was built involved wood. Pine was especially attractive for building purposes. It is durable and strong, yet soft enough to be easily worked with even the simplest of hand tools. It also floats nicely on water, which allowed it to be transported to distant markets across the nation. The central and northern reaches of the Great Lakes states-Michigan, Wisconsin, and Minnesota-all contained extensive pine forests as well as many large rivers for floating logs into the Great Lakes, from where they were transported nationwide.
By 1860, the settlement of the American West along with timber shortages in the East converged with ever-widening impact on the pine forests of the Great Lakes states. Over the next 30 years, lumbering became a full-fledged enterprise in Michigan, Wisconsin, and Minnesota. Newly formed lumbering corporations bought up huge tracts of pineland and set about systematically cutting the trees. Both the colonists and the later industrialists saw timber as a commodity , but the latter group adopted a far more thorough and calculating approach to removing trees. In this sense, what happened between 1860 and 1890 represented a significant break with the past. No longer were farmers in search of extra income the main source for shingles, firewood, and other wood products. By the 1870s, farmers and city dwellers alike purchased forest products from large manufacturing companies located in the Great Lakes states rather than chopping wood themselves or buying it locally.
The commercialization of lumbering was in part the product of technological change. The early, thick saw blades tended to waste a large quantity of wood, with perhaps as much as a third of the log left behind on the floor as sawdust or scrap. In the 1870s, however, the British-invented band saw , with its thinner blade, became standard issue in the Great Lakes states` lumber factories. Meanwhile, the rise of steam-powered mills streamlined production by allowing for the more efficient, centralized, and continuous cutting of lumber. Steam helped to automate a variety of tasks, from cutting to the carrying away of waste. Mills also employed steam to heat log ponds, preventing them from freezing and making possible year-round lumber production.
For industrial lumbering to succeed, a way had to be found to neutralize the effects of the seasons on production. Traditionally, cutting took place in the winter, when snow and ice made it easier to drag logs on sleds or sleighs to the banks of streams. Once the streams and lakes thawed, workers rafted the logs to mills, where they were cut into lumber in the summer. If nature did not cooperate-if the winter proved dry and warm, if the spring thaw was delayed-production would suffer. To counter the effects of climate on lumber production, loggers experimented with a variety of techniques for transporting trees out of the woods. In the 1870s, loggers in the Great Lakes states began sprinkling water on sleigh roads, giving them an artificial ice coating to facilitate travel. The ice reduced the friction and allowed workers to move larger and heavier loads.
But all the sprinkling in the world would not save a logger from the threat of a warm winter. Without snow the sleigh roads turned to mud. In the 1870s, a set of snowless winters left lumber companies to ponder ways of liberating themselves from the seasons. Railroads were one possibility. At first, the remoteness of the pine forests discouraged common carriers from laying track. But increasing lumber prices in the late 1870s combined with periodic warm, dry winters compelled loggers to turn to iron rails. By 1887, 89 logging railroads crisscrossed Michigan, transforming logging from a winter activity into a year-round one.
Once the logs arrived at a river, the trip downstream to a mill could be a long and tortuous one. Logjams (buildups of logs that prevent logs from moving downstream) were common-at times stretching for 10 miles-and became even more frequent as pressure on the northern Midwest pinelands increased in the 1860s. To help keep the logs moving efficiently, barriers called booms (essentially a chain of floating logs) were constructed to control the direction of the timber. By the 1870s, lumber companies existed in all the major logging areas of the northern Midwest.
文章结构:
第一段:五大湖地区中部和北部的河段地区松木丰富,被输送至全国各地。
第二段:伐木公司买地并系统化地砍伐树木。在1860到1890年重大突破:农民不再是木制品的主要来源。
第三段:伐木业的科技化。1带锯条的发明2蒸汽使伐木作业自动化。
第四段:冰雪使原木拖到河流岸边更加容易。消除季节性影响的办法1:在雪道上洒水,冰减轻了摩擦。
第五段:消除季节性影响的办法2:木材轨道。
第六段:长而弯曲的河流使漂浮的原木造成阻塞。解决办法:吊杆的障碍物来控制木材的方向。
答案:ACF
题型:小结题
解析:
选项A正确,对应原文第二段,在十九世纪,伐木业变成了由制造公司控制的大规模工业,而不是由农民控制的地方企业;
选项B 错误,原文第二段,1860年后,伐木业成为成熟的行业,公司买了大片的松木林土地并开始系统化地砍伐树木,说明从伐木到商品,公司运作了整个流程,寻求额外收入的农民也不再是木材的主要来源;
选项C 正确,对应原文第三四段,带锯和蒸汽动力技术进步提高了伐木业的生产率、效率和商业化程度;
选项D错误,未提及新技术的发明,如带锯,使美国伐木公司可以通过向英国和其他国家出口多余的木材来获利。;
选项E 错误,未提及铁路的发展和铺设因为季节性和寒冬而缓慢而困难 ,并且原文说因为周期性回暖等因素才需要铺设铁路来运输木材;
选项F 正确,对应原文第五段,木材轨道把伐木业从季节性活动转变为全年性活动。
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