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the pole length, typically 8 to 10 metres, [22] and size. 9L is a 9 metres long, light pole, other letters used are 'M' (Medium) and 'S' (Stout). the year of treatment and therefore generally the year of installation (e.g. the pole in the picture was treated in 2003) the batch and type of wood used; A date of the last official inspection
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 ...
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.
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.
size 2 from 6.5 feet (2.0 m) to 11 feet (3.4 m), size 3 from 8 feet (2.4 m) to 13 feet (4.0 m), size 4 from 10.5 feet (3.2 m) to 16 feet (4.9 m). The safe load for each prop depends upon the size and extension of the prop. Size 1, 2 and 3 props can take about 34 kN unextended, dropping progressively to less than half of that when fully extended ...
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 ...
But reindeer populations in the northern lands closest to the North Pole have been falling rapidly. Reindeer and caribou herds have shrunk by 56% since the mid-1990s.
Getting a telegraph connection to India was a priority for the government after the Indian Mutiny of 1857; the urgent telegram requesting assistance had taken forty days to reach London. The telegraph went only as far as the coast of India and from there the message travelled by ship. [122] The failure of the first cable was a significant blow.