Bridge composed of broad-bottomed boats, paddled via an internal crank, positioned with a rudder, and fastened together.

Monogrammed "JG" on rock at lower right.

Mechanics: horizontal crankshaft.

Bridge composed of boats, positioned with oars, anchored in place, and connected by unfolding doubled-over bridge sections. See Plate 150 for the transportation of components of bridge by horse.

Monogrammed "JG" on…

See Plate 151 for the assembly of this bridge.

Monogrammed "JG" on rock at lower left.

Mechanics: winch.

Bridge with retracting sections, supported in the water by legs.

Mechanics: winch; roller guides.

Bridge sections composed of trapezoidal prisms are transported rolled up. Unrolled, the sections are connected together with hinges, and the bridge floats on the water.

Mechanics: winch; ratchet; projectile throwing…

This machine uses the principle of Nürnberg scissors, which are also known as Narrenschere (fool's scissors).

Mechanics: winch; Nürnberg scissors.

Bridge with retracting sections.

Mechanics: capstan bars; winch; lantern and rack; roller guides.

Mechanics: hand crank; spur gear and lantern; worm and worm gear; lantern and crown gear; flywheel; lewis.

Especially useful in the construction of large buildings.

Mechanics: hand crank; worm and worm gear; lantern and crown gear; rope drive; flywheel.

Mechanics: internal vertical treadwheel; spur gear and lantern; worm and worm gear.

Mechanics: undershot waterwheel; force pump; conical valve; lantern and crown gear; Three-lobed disc cam; bell crank.

Mechanics: horizontal spoked treadwheel; force pump; conical valve; double interrupted crown gears and lantern gear; spur gear and lantern; horizontal working beam.

Mechanics: undershot waterwheel; force pump; conical valve; double interrupted crown gears and lantern gear; worm and worm gear; horizontal working beam; bell crank.

Mechanics: undershot waterwheel; force pump; lantern and crown gear; grooved eccentric cam; bell crank.

Mechanics: undershot waterwheel; force pump; cylinder cam with single lobe; roller guides.

This device uses a paternoster pump, named for its resemblance to a rosary. Also known as a "rag and chain" pump or a "rubber bucket chain" pump.

Mechanics: hand crank; paternoster chain pump; flywheel.

Barrels of earth and debris can be thrown into the moat from under the front of the machine as a decoy to distract from the doubled-over bridge, which can be unfolded quickly and unexpectedly.

Mechanics: winch; hand…

Accordion folded bridge sections can be quickly and unexpectedly rolled out and brought up to the wall.

Mechanics: capstan bars; hand crank; worm and worm gear; lantern and rack; roller guides.

Mechanics: winch; worm and worm gear; lantern and rack.

Plate oriented in landscape format. Barrels of earth and debris can be thrown into the moat via an opening in the front of the machine as a decoy to distract from the doubled-over bridge, which can be unfolded quickly…

Mechanics: hand crank; worm and worm gear; lantern and rack; roller guides.

Mechanics: hand crank; chain of buckets.

Mechanics: horse whim.

The parallel reciprocating bars used in this device are also known as stangenkunst.

Mechanics: undershot waterwheel; machine crank; bell crank; parallelogram linkage; parallel reciprocating bars.

Mechanics: undershot waterwheel; machine crank; bell crank; roller guides.