New Distance Measuring Instruments

by Raymond W. Tomlinson, Environmental Science Services Administration, Coast and Geodetic Survey, Rockville, MD,

Serial Information: Journal of the Surveying and Mapping Division, 1970, Vol. 96, Issue 2, Pg. 149-155

Document Type: Journal Paper

Abstract: New short range distance measuring instruments give the transportation engineer, land surveyor and geodetic engineer better accuracy, increased production and lower cost per mile of traverse projects. The Wild DI-10 and Tellurometer MA 100 instruments utilize invisible light (infrared) to measure short distances varying from 1 m to 2,000 m. Operation of either instrument is simple and straightforward with a minimum training course. Plumbing instrument and prisms precisely over the point and proper instrument alignment to the prisms is critical. Instrument constants should be checked frequently. Precise distances of 1 part in 50,000 can be measured by one employee in a short time thereby eliminating a taping crew of three to five employees. Refractive index corrections over the short distances are small and can be obtained from the graph supplied. Instruments are compact and operate from a 12-v battery.

Subject Headings: Distance measurement | Prism | Employees | Land surveys | Construction costs | Surveying instruments | Surveys (non-geomatic) | Geodetic surveys | North America | Massachusetts | United States

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