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Temporary adjustments are set of operations which are required to be done on an instrument (theodolite) in order to make it ready for taking observations. Temporary adjustments of theodolite include its setting up, centering, leveling up and elimination of parallax. Therefore these adjustments can be achieved in 4 steps:- * Setting * Centering * Levelling * Focussing ==Setting== The setting operation includes fixing the theodolite with tripod along with approximate levelling and centering over the station mark. For setting up the instrument, the tripod is placed over the station with its legs widely spread so that the centre of the tripod head lies above the station point and its head approximately level (by eye estimation). The instrument is then fixed with the tripod by screwing through trivet. The height of the instrument should be such that observer can see through telescope conveniently. After this, a plumb bob is suspended from the bottom of the instrument and it should be such that plumb bob should point near to the station mark. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Temporary adjustments of theodolites」の詳細全文を読む スポンサード リンク
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