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Brass Dumpy Level Top Bubble 7"
The Hampton Nautical Solid Brass Dumpy Level (also known as an Engineer's Transit) is an instrument of impressive quality and craftsmanship. The Dumpy Level has a 20-power inverting telescope with precision crosshairs and two focusing adjustments. An adjustable spirit level with a protective cover is located on the top of the brass telescope. On the inside of the cover is a mirror to assist in reading the spirit level. There are three leveling adjustments on the base and it is threaded for a surveyor's tripod mount.
Utilizing the fine tuning control allows for the azimuth angle to be accurately adjusted. There is an internal magnetic compass with an inverted compass rose, which can be read correctly through a prism. There is a knurled thumbscrew that you can set in order to freeze the orientation of the compass rose.
- Solid brass housing and body
- Glass optics for clear viewing
- Fully-functional level and transit
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Like the marine sextant, the dumpy is a measuring device that has aided sailing in both navigation and cartography. With two basic components, the tribrach and the telescope, the dumpy measured horizontal lines of sight, with the telescope rotating around a vertical axis. While the marine sextant is a handheld device that measures the altitude of a celestial body from the horizon, the dumpy requires leveling on a solid surface to take accurate readings. For the marine sextant, if no horizon can be seen, a bubble sextant can be used to provide an artificial horizon; balancing itself. The dumpy, however, uses a Tribrach, or set of four foot screws, to allow the telescope to be balanced properly. Using the dumpy telescope, as they did with the brass sextant, sailors expanded knowledge of the new world as they sailed across the vast seas and changed history in the process.