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2. A-Jacks - Wikipedia

   en.wikipedia.org/wiki/A-Jacks

   For example, rock can weigh between 150-175 lb; [2] a suitable rip-rap boulder comparable to a 96 inch A-Jacks unit (about 36 c.f.) would weigh about 5800 pounds, about 16% more than the A-Jacks unit. A-Jacks also have the advantage of being interlocking and self-stabilizing.

3. Crawl space - Wikipedia

   en.wikipedia.org/wiki/Crawl_space

   A crawl space or crawlspace is an unoccupied, unfinished, narrow space within a building, between the ground and the first (or ground) floor. The crawl space is so named because there is typically only enough room to crawl rather than stand; anything larger than about 1 to 1.5 metres (3 ft 3 in to 4 ft 11 in) and beneath the ground floor would ...

4. Jack arch - Wikipedia

   en.wikipedia.org/wiki/Jack_arch

   A jack arch, and a jack arch with a relieving arch above, as illustrated in the Lexikon der gesamten Technik The Mardin jack arch, view from the crypt underneath. A jack arch is a structural element in masonry construction that provides support at openings in the masonry.

5. Strand jack - Wikipedia

   en.wikipedia.org/wiki/Strand_jack

   Animation of a strand jack. Strand jacks can be used horizontally for pulling objects and structures, and are widely used in the oil and gas industry for skidded loadouts. Oil rigs of 38,000 t have been moved in this way from the place of construction on to a barge. Since multiple jacks can be operated simultaneously by hydraulic controllers ...

6. Jack (device) - Wikipedia

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

   A scissor jack use 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 ...

7. FBI, DHS leaders decline to testify publicly about threats ...

   www.aol.com/news/fbi-dhs-leaders-decline-testify...

   WASHINGTON (Reuters) -FBI Director Christopher Wray and Homeland Security Secretary Alejandro Mayorkas declined to appear publicly on Thursday before a U.S. Senate committee to discuss national ...

8. Man goes viral after decorating entire block with Christmas ...

   www.aol.com/man-goes-viral-decorating-entire...

   John Reichart decided to go "all in" this year by decorating every house on his block with Christmas lights for his wife who has Alzheimer's.

9. Lift slab construction - Wikipedia

   en.wikipedia.org/wiki/Lift_slab_construction

   Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground level, negating the ...