毕业论文要用,机器翻译的不行,我英语实在太差,哪位高手帮忙翻译一下万分感谢,人名地名公司名不用翻译,一定要通顺。多谢各位朋友了。3天之内就要交。
Wylie, which has already been mentioned, built
mechanical systems that proved their worth over many decades in stationary and mobile cranes. Other manufacturers wilL, of course, be introduced in due
course as they appear. The period between 1940 and 1949 ends on a confident note. Peace was returning to the world and cranes were re-building the shattered nations rather than lifting destructive bombs into place. In the first volume of this series, 500 Years of Earthmoving, the author, Heinz-Herbert Cohrs, asked of this period "Was there anybody who was not building construction machines?" We, too, can now ask this same question about cranes. It is clear that engines were becoming more powerful, crane control systems (elec-tric, hydraulic andpneumatic) were becoming more sensitive and the spectrum of use had grown considerably. There were some very advanced slewing tower cranes on the market and new ways of using cranes were being developed around the world. Take yard cranes, for example, which turned out to be in
dispensable aids right until the end of the decade, and prepared the way for the much bigger machines to come!
Picture 204: This pneumatically controlled MAN rail mounted crane was driven by a truck engine and could lift 6 tonnes at a 7 metre radius.
Picture 205: The Wylie DL rope tension meter was introduced in 1948 and helped to monitor load moment. It was the forerunner of complex electronic systems.