Civil Engineering - Surveying - Discussion

100m radius of curvature means 1/100m of radius which is 1 cm radius of the bubble tube.

The axis of the bubble tube is not an axis passing through the bubble tube-like telescope. It's an arc that passes through the midpoint of the bubble tube length. For a deflection of theta degree at the center of the earth what deflection it makes on the surface of the earth is called its sensitivity. Similarly, the arc of the bubble tube also has a center at the center of the earth and so the radius of curvature is generally taken as 100m.

What is mean by the radius of curvature?

Explain please.

Greater is the radius of the Curvature lesser is the sensitivity.

Sensitivity = Length of one division on tube / Radius of curvature.
= L/R.

If R is more, sensitivity is less.

I think it's not possible. Anyone, explain this in clearly.

Right, explain it clearly.

A bubble tube's glass cover (through which you can see a circle in the middle of the liquid) is typically 100m, where a higher radius means a flatter surface and greater tendency/rate of movement for any tilt or disturbance.

Think of the radius of curvature as "what radius of a circle I would need to generate this kind of curve". For visualization: a 2cm wide marble has a radius of curvature of 1cm, and you are certain that it is very much curved. Meanwhile, in some sense, you can say that flat ground has a radius of curvature equal to R🜨.

I'm just continuing the comments here, and idk if bubble tube is also the same as bubble level in total stations, survey rods, and leveling staffs.

Why it would be 100 m?

Why is 100m?

Could you please explain briefly?