This rangefinder does not require a measuring rod at the target and could perhaps be considered the first true telemeter. Two mirrors set a distance apart horizontally in a long slim box, similar to a subtense bar but located at the measuring station, and forming two images. In 1778, Georg Friedrich Brander invented the coincidence rangefinder. Green for its invention in 1778, even though they were made aware of Watt's priority. The Royal Society of Arts gave an award to W. Several others have been credited with the invention of the rangefinder telemeter at one time or another. The distance to the rod could then be determined from the distance between the targets on the rod by trigonometry. At the point to be measured, two sliding targets on a surveyor's rod were adjusted to align with the hairs in the telescope. It consisted of two parallel hairs in the focal plane of a telescope eyepiece crossing an upright hair. Watt called his instrument a micrometer, a term now used with a different meaning in engineering (the micrometer screw gauge). The first rangefinder telemeter was invented by James Watt in 1769 and put to use in 1771 in surveying canals. The word telemeter is derived from Ancient Greek τῆλε ( têle) 'distant, far away', and μέτρον ( métron) 'something used to measure'.ĭesigns Telemeter salvaged from the German cruiser Admiral Graf Spee on display in Montevideo. They were specially useful for finding the range of a target, such as in naval gunnery and anti-aircraft artillery. Originally optical devices used in surveying, they soon found applications in other fields, such as photography and in the military. Portable stereoscopic telemeter from WWII The coincidence rangefinder of the Polish destroyer ORP Wicher Laser rangefinder Second World War German range finding tower at La Corbière JerseyĪ rangefinder (also rangefinding telemeter, depending on the context) is a device used to measure distances to remote objects. For the photographic camera, see Rangefinder camera.
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