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A level staff, also called levelling rod, is a graduated wooden or aluminium rod, used with a levelling instrument to determine the difference in height between points or heights of points above a vertical datum. When used for stadiametric rangefinding, the level staff is called a stadia rod.
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Diagram showing relationship between two level staff, or rods, shown as 1 and 3. The level line of sight is 2. The surveyor looks through the eyepiece of telescope while an assistant holds a vertical level staff which is graduated in inches or centimeters. The level staff is placed vertically using a level, with its foot on the point for which ...
A Philadelphia rod is a level staff used in surveying. The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom.
The level staff is placed with its foot on the point for which the level measurement is required. The telescope is rotated and focused until the level staff is plainly visible in the crosshairs. In the case of a tilting level, the fine level adjustment is made by an altitude screw, using a high accuracy bubble level fixed to the telescope.
Three-section staff. The three-section staff, three-part staff, triple staff, originally sanjiegun (Chinese: 三節棍; pinyin: sānjiégùn; Jyutping: saam1 zit3 gwan3) or sansetsukon (Japanese: さんせつこん), three-section whip, originally sanjiebian (Chinese: 三節鞭; pinyin: sānjiébiān; Jyutping: saam1 zit3 bin1), is a Chinese flail weapon that consists of three wooden or metal ...
Levelling staff – specialized measuring stick or vertical staff used with the dumpy level, held by a second person while the operator of the level looks through it and takes readings off of the staff. Also call a rod. Reduced level (RL) – equating elevations of survey points with reference to a common assumed datum. The elevation is ...
Jacob's staff in the Museo Galileo, Florence Measuring the height of a star with a Jacob's staff. The term Jacob's staff is used to refer to several things, also known as cross-staff, a ballastella, a fore-staff, a ballestilla, or a balestilha. In its most basic form, a Jacob's staff is a stick or pole with length markings; most staffs are much ...