DIA PHRAGM
- seotskpak
- Nov 9, 2016
- 2 min read
DIA PHRAGM; the diaphragm is a brass ring fitted inside the telescope, just in front of the eye-piece, ft can he adjusted by four screws. The ring carries the cross- hairs, which get magnified when viewed through the eye-piece. The cross hairs may be marked hi the following ways; with spider webs stretched across the ring.by very fine scratch marks made in a glass fitted with the ring, or by means of platinum wires silk threads stretched across the ring. Technical Data used in the field explained in civil surveyor course in rawalpindi. by very fine stretch marks made in a glass fitted with the ring, or by means of platinum wires or silk threads stretched across the ring.1; two vertical hairs meant maintaining the vertically of the staff. 2;middle horizontal hairs representing the line of collimation.3; upper stadia hairs and lower stadia hairs are meant to determining by the horizontal distance between the positive of level and that of the staff.
Points to be remembered by staff man; 1; the staff should be made vertical by holding in with both arms while standing behind it.2; the staff should be held on firm ground.3; when the telescopic staff is to b extended, care should he taken sop that is perfectly stretched and properly fixed on the spring catcher, 4; the bottom of the staff should be kept clean, Some more details of civil surveyor course in rawalpindi are as under.
points to be remembered by level man ; 1; the leveling instrument should be placed at a position suitable for the greatest number of observations to be taken. 2; the instrument should not be too high or too low.3; the leveling should be done perfectly. 4; the leveling instrument should not be placed on the profile line( i.e. the center line of project). 5; the eye-piece should be focused by bolding a sheet of white paper in front of the telescope.6; the objective should be focused by pointing the telescope towards the staff. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join civil surveyor course in islamabad.
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