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relascope
The relascope, invented by Walter Bitterlich, is a multi-use instrument for forest inventory. It is primarily used to find height of a tree, basal area of a tree and diameter of a tree anywhere along the bole. This instrument is used mostly for applications involving variable radius sample plots in a forest survey.
==Method of operation==
The relascope has a sight hole on the back and a clear window at the front to allow the user to sight through the tool. There are three light inlet holes which are used to light the scale. This is one of the major problem with the relascope, the way this instrument is designed it cannot be used when light is at a minimum.〔 This is not a problem in a similar piece of equipment called the tele-relascope. This instrument differs from the relascope in that the tele-relascope is an electronic laser based version.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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