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Where is the brass tallies provided in the 20 m metric chain?
Every 1m length
Every 5m length
In starting of chain
End of chain
Every 5m length
In a 20 m metric chain, brass tallies are provided at every 5 m length to facilitate quick measurement and identification of chain length without counting every link. These tallies are strategically placed to divide the 20 m chain into four equal segments.
In a 20 m metric chain, brass tallies are provided at every 5 m length to facilitate quick measurement and identification of chain length without counting every link. These tallies are strategically placed to divide the 20 m chain into four equal segments.
LtallyтАЛ=5n тАФ where LtallyтАЛ is the distance of the tally from the nearest handle and n is the number of teeth on the brass tally.
Tallies are shaped metal pieces attached to the chain links. A single-tooth tally indicates 5 m or 15 m from either end, while a two-tooth tally indicates 10 m (the center of the chain). This system allows the surveyor to identify the distance from the nearest handle rapidly, reducing errors in reading large distances.
Tallies at 5m and 15m have one tooth.
The central tally at 10m has two teeth.
Brass rings are used at every meter length to assist in precise sub-meter reading.
Brass tags (tallies) help avoid counting individual links (usually 100 links in 20m chain).
Reduces manual counting errors
Increases speed of field survey
Tallies can get detached or worn out
Accumulation of dirt may hide tally markings
Land surveying
Boundary marking
Preliminary site measurement
For a 30 m chain, tallies are provided at 5 m intervals (5, 10, 15, 20, 25 m).
Option A is incorrect because rings are provided every 1m, not brass tallies.
Options C and D are incorrect as tallies are index markers within the span, not the terminals.
B is correct тАФ Brass tallies are provided at every 5 m length to mark the intervals of a 20 m metric chain.
Remember that brass rings denote 1m intervals, whereas brass tallies denote 5m intervals. Confusing these is a common source of negative marks in Surveying.