Mechanical Sawmill [Medieval Inventions Series]
Mechanical Sawmill belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Ratchet and Pawl [Medieval Inventions Series]
Ratchet and Pawl belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Crank Handle [Medieval Inventions Series]
Crank Handle belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Button and Buttonhole [Medieval Inventions Series]
Button and Buttonhole belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Chimney [Medieval Inventions Series]
Chimney belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Caravel [Medieval Inventions Series]
Caravel belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Cog Ship [Medieval Inventions Series]
Cog Ship belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Dry Dock (Song Dynasty Design) [Medieval Inventions Series]
Dry Dock (Song Dynasty Design) is placed in medieval invention history, using the title and category metadata to define the subject.
Pound Lock [Medieval Inventions Series]
Pound Lock belongs to medieval invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Bow Drill Tool [Ancient Inventions Series]
Bow Drill Tool belongs to ancient invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Spring Scissors [Ancient Inventions Series]
Spring Scissors belongs to ancient invention history; the scope remains centered on the named subject and the period indicated by its assigned category.
Codex Book Format [Ancient Inventions Series]
Codex Book Format is a book made from separate leaves or folded sheets gathered and bound along one edge. Its later development is traced.
Wheelbarrow (Han Dynasty) [Ancient Inventions Series]
Wheelbarrow is a hand-propelled carrier that places a load on a frame supported partly by a single wheel. Its historical setting is also noted.
Anchor [Ancient Inventions Series]
Anchors limit vessel drift through weight, friction, or seabed penetration, with materials, early evidence, uses, and later development traced.
Lock and Key [Ancient Inventions Series]
Lock and key systems use matching keys to align internal parts and release or secure fasteners, with their early forms and later development traced.
Groma Surveying Instrument [Ancient Inventions Series]
Groma Surveying Instrument used suspended plumb lines to establish straight alignments and right angles. Its later development is also traced.
Plumb Bob [Ancient Inventions Series]
Plumb Bob is a dense weight suspended from a cord to create a visible local vertical reference. Early evidence and later changes are traced.
Balance Scale [Ancient Inventions Series]
Balance Scale is a measuring instrument that compares unknown and known masses through beam equilibrium. Its later development is traced.
Nilometer [Ancient Inventions Series]
Nilometer is a fixed river-level gauge used to measure the rise and fall of the Nile against a marked scale. Its later development is traced.
Shaduf [Ancient Inventions Series]
Shaduf is a hand-operated, counterweighted lever that raises water from a lower source to a higher channel, basin, or field.
Steam engine (Watt design) [Industrial Age Inventions Series]
Steam engine is a more fuel-efficient steam engine design that kept the working cylinder hot while condensing steam in a separate chamber.
