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Francis Henry Brown

    Henry Brown, narodený ako otrok vo Virgínii, si vydobyl slobodu dramatickým útekom do Philadelphie, ukrytý v debni poslanej poštou. Po dosiahnutí slobody sa stal prominentným abolicionistom, cestoval a prednášal o hrôzach otroctva, čím sa stal symbolom odporu. Jeho odvážny čin a následné svedectvo inšpirovali a prispeli k boju za zrušenie otroctva. Svojím životom a rozprávaním poukázal na neľudskosť systému a silu ľudského ducha.

    Silber-Grusel-Krimi 450
    507 Mechanical Movements
    • 507 Mechanical Movements

      • 128 stránok
      • 5 hodin čítania

      Epicyclic trains, oblique rollers, trip hammers, and lazy-tongs are among the ingenious mechanisms defined and illustrated in this intriguing collection. Spanning the first century of the Industrial Revolution, this 1868 compilation features simplified, concise illustrations of the mechanisms used in hydraulics, steam engines, pneumatics, presses, horologes, and scores of other machines.The movements of each of the 507 mechanisms are depicted in drawings on the left-hand page, and the facing page presents a brief description of the item's use and operation. Ranging from simple to intricately complex, the mechanisms offer a fascinating view of the variety of small components that constitute complex machinery. A detailed index provides easy reference to specific mechanisms.Inventors, tinkerers, and anyone with an interest in the history of invention and technology will find this volume a treasury of information and inspiration.

      507 Mechanical Movements
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