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2. Railway slide fence - Wikipedia

   en.wikipedia.org/wiki/Railway_slide_fence

   This slide fence consists of a series of fence sections, typically as shown in the SLIDE FENCE DETAIL drawing (pictured right). Each fence section is held in place by strong springs. At each end are electro-mechanical plugs, which maintain a continuous electrical circuit that is monitored by signaling equipment. In normal operation, the current ...

3. Barrier-grid animation and stereography - Wikipedia

   en.wikipedia.org/wiki/Barrier-grid_animation_and...

   Barrier-grid animation or picket-fence animation is an animation effect created by moving a striped transparent overlay across an interlaced image. The barrier-grid technique originated in the late 1890s, overlapping with the development of parallax stereography ( Relièphographie ) for 3D autostereograms .

4. Site plan - Wikipedia

   en.wikipedia.org/wiki/Site_plan

   Such a plan of a site is a "graphic representation of the arrangement of buildings, parking, drives, landscaping and any other structure that is part of a development project". [2] A site plan is a "set of construction drawings that a builder or contractor uses to make improvements to a property. Counties can use the site plan to verify that ...

5. Ha-ha - Wikipedia

   en.wikipedia.org/wiki/Ha-ha

   Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward. A ha-ha (French: hâ-hâ or saut de loup), also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier (particularly on one side) while preserving an uninterrupted view of ...

6. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   homepage.aol.com

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Joseph Glidden - Wikipedia

   en.wikipedia.org/wiki/Joseph_Glidden

   Patent drawing for Joseph F. Glidden's Improvement to barbed wire. Glidden began work on ways to make a useful barbed wire to fence cattle in 1873. He made his best design of barbed wire by using a coffee mill to create the barbs. Glidden placed the barbs along a wire and then twisted another wire around it to keep the barbs in place, in a ...