stadia rod
noun
: a graduated rod used with an instrument having stadia hairs to measure the distance from the observation point to the place where the rod is positioned by observation of the length of rod subtended by the distance between the stadia hairs when these are fixed or of the space between the stadia hairs when they are adjusted to cover a certain definite interval on the rod
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“Stadia rod.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/stadia%20rod. Accessed 26 Nov. 2024.
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