| Instruments/Parts of instruments | Operations | ||
| P | Bubble tube | i | Tacheometry |
| Q | Plumb bob | ii | Minor movements |
| R | Tangent screw | iii | Centering |
| S | Stadia cross-wire | iv | Levelling |
| Point | Staff Readings Back side | Staff Readings Fore side | Remarks |
|---|---|---|---|
| P | -2.050 | - | 200.000 |
| Q | 1.050 | 0.95 | Change Point |
| R | - | -1.655 | - |