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  2. Whistle post - Wikipedia

    en.wikipedia.org/wiki/Whistle_post

    The sign on a Queensland whistle post on the old Gibson Island line. In Australia, whistle posts consist of a pole or upright flat-bottom rail with a white or reflective yellow X. In Queensland, A whistle post is mounted on a metal pole or old rail. The board is a flattened white triangle with rounded edges and a black W.

  3. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...

  4. Post pounder - Wikipedia

    en.wikipedia.org/wiki/Post_pounder

    A red-colored post pounder next to two green steel t-posts. A post pounder, post driver, post rammer, post knocker or fence driver is a tool used for driving fence posts and similar items into land surfaces. It consists of a heavy steel pipe which is closed at one end and has handles welded onto the sides. It is normally used by one person, but ...

  5. Fused grid - Wikipedia

    en.wikipedia.org/wiki/Fused_grid

    A 2X2 km square segment of the street network of Paris with an approximate scale bar. It shows the highly irregular city blocks and the range of street orientations, both common attributes of many historic cities. Uniform grids with fixed cardinal directions can be mapped as easily on paper as on the mind.

  6. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings.

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