Patents For Inventions: Abridgments Of Specifications Relating To Air, Gas, And Other Motivepower Engines. A.D. 1635-1866. This 1873 British abridgment from the Patent Office surveys diverse motive-power concepts outside steam, compiling abstracts of early to mid-19th century innovations in air, gas, and elastic-fluid engines. It documents a wide range of inventive approaches—heated air and caloric cycles, regenerative heat exchange, gas- and vapour-driven pistons, rotary and oscillating engine geometries, compressed-air storage and transmission, vacuum- and atmospheric-power methods, and speculative perpetual-motion notions. Entries are often provisional, with patent numbers, dates, drawings, and notes on protection status, accompanied by an index and notes on related literature. The collection highlights a vibrant era of experimental engineering, taxonomy-ready for historical study and classification under motive-power engines.
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