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U.S. Patent No 8771 drawing image Patent 8771 image close-up of parts Shaker ladder chair with ball swivels on rear legs for tilting. The Shaker tilting chair – named for its ball bearing or ball and socket [A] button mechanism assembled to the back two legs of a wooden chair – allowed a person to lean back in the chair without slipping or scraping the floor.
A swivel, swivelling, spinny, or revolving chair is a chair with a single central leg that allows the seat to rotate 360 degrees to the left or right. A concept of a rotating chair with swivel castors was illustrated by the Nuremberg noble Martin Löffelholz von Kolberg in his 1505 technological illuminated manuscript , the so-called Codex ...
An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is usually a swivel chair , with a set of wheels for mobility and adjustable height. Modern office chairs typically use a single, distinctive load bearing leg (often called a gas lift ), which is positioned underneath the chair seat.
A surveyor's leveling instrument has a spirit level mounted on a telescope (perhaps 30 power) with cross-hairs, itself mounted on a tripod. The observer reads height values off two graduated vertical rods, one 'behind' and one 'in front', to obtain the height difference between the ground points on which the rods are resting.
A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom. On the back of the rod the graduation decrease from 13.09 ft at the bottom to 7 ft. The division of the device in two sliding sections are devised for ease of transport.
Celebrity: American actress and film producer Reese Witherspoon Animal:Donkeys Names: Honky and Tonky Make a good pet? Yes, if you have the space. Catherine of Aragon’s monkey
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