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Surveying

Surveying
The correction for parallax, is

- 8".8 cos α
- 8".8 cos α
+ .8" sin α
+ 8".8 cos α

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Surveying
For accurate work, the steel band should always be used in preference to chain because the steel band

can be easily repaired in the field
is easier to handle
is lighter than chain
is practically inextensible and is not liable to kinks when in use

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Surveying
Sensitiveness of a level tube is designated by

length of bubble of level tube
length of level tube
radius of level tube
None of these

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Surveying
The want of correspondence in stereo-photographs

Is not affected by the change of flying height between photographs
Is minimum when θ is 3°
Is a good property
Is a function of tilt

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Surveying
The following sights are taken on a “turning point”

foresight only
foresight and backsight
foresight and intermediate sight
foresight only

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Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Isocenter
Principal point
Plumb point
Perspective centre

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