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2. Jack (device) - Wikipedia

   en.wikipedia.org/wiki/Jack_(device)

   A scissor jack uses the mechanical advantage of a leadscrew and 4-bar linkage to allow a human to lift a vehicle by manual force alone. They are inexpensive and are common in manufacturer-supplied breakdown kits. The jack shown at the left is made for a modern vehicle and the notch fits into a jack-up point [3] on a unibody. Earlier versions ...

3. Hydraulic rescue tool - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_rescue_tool

   A hydraulic spreader in use, seen here widening a window on the door of a Volkswagen Golf Mk2 to allow fire crews access into the vehicle. The Hurst Rescue Tool was invented by George Hurst, circa 1961, after he viewed a stock car race accident in which it took workers over an hour to remove an injured driver from his car.

4. Stabilizer (aeronautics) - Wikipedia

   en.wikipedia.org/wiki/Stabilizer_(aeronautics)

   A Boeing 737 uses an adjustable stabilizer, moved by a jackscrew, to provide the required pitch trim forces. Generic stabilizer illustrated. A horizontal stabilizer is used to maintain the aircraft in longitudinal balance, or trim: [3] it exerts a vertical force at a distance so the summation of pitch moments about the center of gravity is zero. [4]

5. Eastern span replacement of the San Francisco–Oakland Bay ...

   en.wikipedia.org/wiki/Eastern_span_replacement_of...

   Jack and tension 26 of 50 suspender groups on each side (8 at a time in the first 3 steps, 2 in the fourth step), followed then final adjustments (steps 5–18). In the first 8 steps, 80% of the load was transferred from the temporary truss to the cable. 2: Jack and tension 3 more suspender groups, bringing the total to 29 of 50 on each side. 3