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The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...
The level must be horizontal to get a valid measurement. Because of this, if the horizontal crosshair of the instrument is lower than the base of the rod, the surveyor will not be able to sight the rod and get a reading. The rod can usually be raised up to 25 feet high, allowing the level to be set much higher than the base of the rod.
4 Temporary adjustment of level. 1 comment. 5 How To Use a Dumpy Level. 2 comments. 6 How different? 1 comment. Toggle the table of contents. Talk: Level (optical ...
Combining a spirit level with an optical telescope results in a tilting level or dumpy level. [5] These leveling instruments as used in surveying to measure height differences over larger distances. 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 ...
At the end of the Second World War, a film entitled Cooke Troughton & Simms in Wartime 1939-1945 was released which documented the manufacturing processes used to produce many of the optical instruments which were used in tanks, aeroplanes and on ships. The Haxby Road factory was re-designated "Kingsway North" with a workforce of 900 in 1939 ...
In 1835 George Airy became Astronomer Royal and commissioned new instruments. Large castings were contracted to Maudslay and Ransomes. Optical parts were often supplied by Dollond. From about 1830 to 1850 Britain was gripped by Railway Mania resulting in high demand for levels and theodolites. Troughton & Simms exhibited at the Great Exhibition ...
Peacock's new documentary series, 'SNL50: Beyond Saturday Night' is now streaming. Here's a list of the show's cast members and featured celebrities.
The level incorporates a bubble tube and a large magnetic compass. [13] John Grundy, Sr. (c. 1696–1748), land surveyor and civil engineer, obtained a precision level with telescopic sights from Sisson before 1734. The instrument was accurate to less than 1 inch (25 mm) in 1 mile (1.6 km). [14]