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  2. Utility pole - Wikipedia

    en.wikipedia.org/wiki/Utility_pole

    Telegraph pole with spars, insulators and open wires on a now decommissioned Railway Pole Route, Eccles Road, Norfolk, United Kingdom. A pole route (or pole line in the US) is a telephone link or electrical power line between two or more locations by way of multiple uninsulated wires suspended between wooden utility poles. This method of link ...

  3. Rod (unit) - Wikipedia

    en.wikipedia.org/wiki/Rod_(unit)

    The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units , it is defined as 16 + 1 ⁄ 2 feet , equal to exactly 1 ⁄ 320 of a mile , or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain ), and is exactly 5.0292 meters.

  4. File:Telegraph Poles, Boston - geograph.org.uk - 1206673.jpg

    en.wikipedia.org/wiki/File:Telegraph_Poles...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  5. Joseph Oppenheimer - Wikipedia

    en.wikipedia.org/wiki/Joseph_Oppenheimer

    The Oppenheimer pole could be erected to 3 meters in height, and was available in a light weight narrow version, or a broader one. The Oppenheimer poles were designed using three oval shaped galvanised pipes of different diameter and each pipe would slide inside the next.

  6. Oppenheimer pole - Wikipedia

    en.wikipedia.org/wiki/Oppenheimer_pole

    Oppenheimer poles are galvanised iron telegraph poles. They consist of three oval sections that collapse into each other telescope-style for transportation. Once extended, the joints between the sections are clamped with collars. The pole is fixed to a base for support with a u-bolt. The poles were used in the construction of the Australian ...

  7. Optical telegraph - Wikipedia

    en.wikipedia.org/wiki/Optical_telegraph

    In 1808 the Royal Telegraph Institution was created and Edelcrantz was made director. [59] The Telegraph Institution was put under the jurisdiction of the military, initially as part of the Royal Engineering Corps. [60] A new code was introduced to replace the 1796 codebook with 5,120 possible codepoints with many new messages.

  8. Portolan chart - Wikipedia

    en.wikipedia.org/wiki/Portolan_chart

    A portolan nautical chart of the Mediterranean Sea, second quarter of the 14th century. Kept in the Library of Congress, where it is the oldest original cartographic artifact. Portolan charts are nautical charts, first made in the 13th century in the Mediterranean basin and later expanded to include

  9. Pin insulator - Wikipedia

    en.wikipedia.org/wiki/Pin_insulator

    A pin insulator is a device that isolates a wire from a physical support such as a pin (a wooden or metal dowel of about 3 cm diameter with screw threads) on a telegraph or utility pole. It is a formed, single layer shape that is made out of a non-conducting material, usually porcelain or glass. It is thought to be the earliest developed ...