• Compass survey is a method of surveying by taking bearings and linear distances to produce plan.
• Bearing is measured using prismatic compass, while the linear distance is measured using measuring tape.
• Bearing in compass surveying means angle is made by chain line or survey line by referring it to magnetic meridian or magnetic north.
Consists of telescope eyesight and an adjustable tubular spirit level, which is connected to a semicircular protractor scale and vernier marked in both slope and degrees (90°).
A magnifier glass assists in accurate reading the degree of inclination from vernier.
The Hand Level is a small, economical level for use with preliminary surveys to determine traveller way or cable way steel work elevations and other feasibility type site reconnaissance work.
The Abney Level is very similar to a clinometer in that it is used to measure the value of a slope by means of arc measure and grade percentage.
Specification of Abney Level
• Used to determine slope angle, tree heights etc
• Graduated 0-+/-90 degrees, 0-+/-100% on a stationary arc
• Vernier reads to 10
• Scale pointer incorporates friction thumb lock
• Includes carry case
• The levelling staff of sturdy design that meets the requirements for intensive field work.
• The staff material should be one of the following: teak, cypress, kail, aimi, champ, hollock or aluminium alloy.
• If timber is used as staff material, then it has well seasoned, sawn in radial direction and free of defects.
• The staff is telescopic, comprising three sections without any joint in length.
• The top plate made of aluminium, anodised black.
• Length 4 m
Accessories
• Circular bubble sensitivity of 25 minutes per 2 mm run.
• Carrying case canvas.
• Plummet fittings for test and adjustment of bubble.
• Made of Aluminium/brass.
• Size 100mm, 125 mm, 150 mm dia.
• Complete in Case with Aluminium Telescopic/Rigid/Wooden Tripod.
• Aluminium circle consist of a needle graduated to 30min (0.5) graduations.
• Painted with water proof paints.
• Carrying cases are made of Fibre with carrying straps. Least count 30'.
Ranging Rod that made of steel conduct pipe of 25mm dia.
Alternatively painted international orange & white.
Fitted with strong iron shoe at the bottom.
Sizes Available :
• Size 2 meter single
• Size 3 meter single
• Size 2 meter 2 fold
• Size 3 meter 3 fold.
Size 178 mm /7 Internal focusing, anti reflection coated optics with tilting arrangement and Fitted with revolving horizontal circle graduated to read 6 minutes with vernier and a provision to preset zero degree quickly.
The tilting drum is graduated to read 1 : 5000 is incorporated for fine adjustment and accuracy.
Supplied with accessories and adjusting tools Packed in PVC Plastic box with Aluminium telescopic stand in carrying canvas cover.
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