3/14/2023 0 Comments Plumb bob uses![]() ![]() Raise or lower the plumb bob using the sliding loopknot Lower down the plumb bob within about 0.5 cm above the ground point Bring the plumb bob close to the center of the point by moving or pressing 1 or 2 tripod legs more firmly into the ground ġ. ATTACHING THE PLUMB BOB Plumb bob and a string is attached to the transit by suspending it from the hook and chain that hangs at the bottom of the leveling head. Set the tripod in a convenient height (no need to stretch or stoop)ģ. Tripod is set up near and over the selected point with the legs well spread apart to ensure stability see to it that the tripod head is nearly stableġ of its legs should extend uphill and the 2 downhill each tripod leg is then moved as required to make the tripod head nearly levelģ. Used for attaching a string an a plumb bob so that the instrument may be set exactly over the selected point on the ground PLUMB BOB CHAIN Chain with a hook: Suspended from the bottom part of the leveling head assembly Hangs between the tripod legs Used for leveling the instrument by the plate levels Operate in pairs and always turned in opposite directions Screws are loosened when desired to shift transit laterally with respect to the foot plate LOWER TANGENT SCREW Used to make precise settings after the lower clamp is tightened It moves the lower plate to a desired exact position using a small range of movement ![]() Leveling Head Assembly Lower part of the transit Allows the transit to be leveled and centered over a point Consists of: īottom horizontal foot plate 4 leveling screws plumb bob chain a device that permits small lateral movements of transit Or horizontal circle Where horizontal angles are measured Graduated on its upper face and divided aro its circumference into 360 o and further subdivisions Can be held stationary while the upper plate rotated or can be rotated independentlyĪttached to the horizontal circle Does not rotate with the horizontal circle Used to control the rotation of the horizontal circle Stops any motion between the leveling head and the lower plate Small telescope thru the vertical center of the transit Enables the instrument to be centered over a given point quickly and precisely by means of an optical systemĪ locking device When tightened, it causes the upper and lower plates to lock together Most have round heads and usually turn in the direction tangent to the motion they control To hold the telescope horizontal or any desired inclination Located near the horizontal axle of the transitĮnables the telescope to be rotated in small movements about the horizontal axis when the telescope clamp is tightened Useful when setting the cross hairs precisely on a distant point sighted PLATE VERNIERS Two opposite verniers (A & B) A vernier is adjacent to the eyepiece where it is easily u sed B vernier is 180o from A vernier To the telescope and rotates with it to measure vertical angles To establish the upper and lower plates in a horizontal plane PLATE LEVEL VIALS Positioned at right angles to each other Used Allow rough checks on measured ang Magnetic needle can be lifted from its pivot needle lifter Elevate or depress the telescope by rotating on an axis perpendicular to the Hold into position the horizontal axle level 2. Integral parts of the upper plate Used to: 1. Can be rotated about its horizontal axisĭirect position => level vial is above the telescope Reversed position => level vial is below the telescope Of the entire top of the transit Entire assembly rotates about a vertical axis Contains the ff: verticalĬircle and vernier supports the telescope and level tube compass box circular cover plate and plate level vials upper clamp tangent screw needle lifterįor: 1. Parts of of th the En Engineer’s Tr Transi Main Pa Parts of of th the En Engineer’s Tr Transit Protractor mounted in the horizontal plane and the other in a vertical plane Directio Directional nal Theod Theodolit olite e III. Repe Repeat atin ing g The Theod odoli olite te II. Types ypes of Theo Theodo dolit lite e I. Leveling Leveling of the Transit Transit IV. Setting Setting up the the transi transitt III. Leveling Leveling Head Assembly Assembly II. Engine Engineer’ er’s s Transi ransitt I. To Roemer, Roemer, a Dani Danish sh Astr Astron onom omer er, who who in 1690 1690 used used the the inst instru rume ment nt to obse observ rve e the the pass passag age e (tra (trans nsit it)) of star stars s acro across ss the the cele celest stia iall meridian Outline The Engineer’s Transit and Theodolite Lecture 6 GE10: General Surveying Iĭepartment of Geodetic Engineering University of the Philippines, Diliman THERMODYNAMICS Surveying Hand CHAPTER 4 Signals Lecture 6-The Engineer's Transit and Theodolite ![]()
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