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The open-truss-structure cradle is constructed of machined aluminum frame sections and chrome-plated steel longeron and keel trunnions . No longer simply designers and producers of machines , mechanical engineers now study the potential of alternative energy systems and develop ways to conserve resources . There is a very readable historical introduction as part of chapter 1 ( and also in chapter 2 ) and there is an excellent chapter 5 on physical properties of crystals . Why am I fascinated by the workings of machines ? " This vulnerability is noteworthy because of the widespread use of the TCP standard , and the large number of machines that are potentially impacted . This medium sized text is intended to give the reader a readable comprehensive overview of all aspects of a cataract from its numerous perspectives , eg epidemiology , medicolegal aspects and Third World issues , in addition to providing an exposition of past , present and future surgical techniques for its removal . The style is of a treatise on the philosophy of belief systems written in a readable academic prose . Each machine is a cluster of CPUs , and the collection of machines is in turn a cluster .