%!$ Easy Diy Woodworking Bench Plans For You #!@

tape-and-compass-survey-website How To Carry Out a Survey and Site Measure | L'Essenziale

Compass is an instrument designed for the measurement of direction with Free Digital Tape Measure App Android 40 the reference to the magnetic meridian. This type of compass is a light and simple instrument and is used shrvey rough surveys where too much accuracy is not necessary. This compass is made into a box which is tape and compass survey website and 85 to mm in diameter. In the center of the compass box, is a pointed steel pivot is used. A magnetic needle of broad form is balanced over the pivot, and to this is fixed a light aluminum ring.

The graduations are websige such tape and compass survey website the zero is at the south, 90 degrees at the west, degrees at the north and degrees at the east, i.

The figures showing the readings on tape and compass survey website aluminum ring are written inverted, and a glass lid covers the top of the compass box.

Dramatically, opposite the compass box are fixed the object or sight vane and wehsite eye vane. The latter carries a reflecting prism. The eye vane is fixed at the top of the prism. The reflecting prism can be raised or lowered to suit the eyesight of the observer by means of the focusing stud. A hinge is provided so that the prism may be folded over the edge of the box when it is not in use.

When the eye is brought near the eye vane, the graduations on the ring are reflected to the eye and the same can be read.

The horizontal and vertical sides of the prism are made convex tape and compass survey website that the readings on the ring are magnified. The object vane consists of a metal frame hinged to the box. In the center of this metal frame is fixed a vertical horse hair or a compass wire or silk thread.

When the prismatic compass is not in use the object vane may be folded over the glass lid, covering the top of the box. When the object vane is folded over the glass lid, it presses a lifting pin which lifts the magnetic needle above the pivot and keeps it against the glass lid.

Thus the wear and tear of the cpmpass are reduced by keeping the magnetic needle away from the same when the instrument is not in tape and compass survey website. A spring brake is provided inside the box to damp the sudvey of the magnetic needle, i.

By pressing the brake pin inward, the Spring may be made to come in contact with the magnetic needle thereby arresting the oscillations. The object wesite may be provided with tape and compass survey website hinged mirror which may be slid to any position on the object vane, and the mirror can be made to incline on any angle. Sun glasses are provided to sight luminous objects.

They are simply interposed in the line of sight and tape and compass survey website the strain on the eyes of the observer. In the prismatic compass, the magnetic needle and the graduated rings are attached together and, therefore, they remain always along the north-south line when the box is rotated.

As the zero graduation is at the south end of the needle, and the sight and eye vanes are exactly opposite, when the north end is at the sight vane, the south end will be comass the eye vane, i. This type of compass, being a very light and simple instrument, is extensively used for preliminary surveys of roads, rough traverses, etc.

For taking readings with a prismatic compass, the same may be held in hand and turned till the ranging rod on the next station is bisected by tape and compass survey website cross hair when seen through the eye-vane.

Tape and compass survey website instrument tape and compass survey website be held as nearly level as can be judged. If the needle does not oscillate, it means that it is touching the glass lid and is not being held vertical.

It should tape and compass survey website held properly, and the brake knob pressed lightly. Then the reading is taken. This gives the bearing of the line joining the point vertically below the compass and the point on which the Levelling Staff is held. Even though webdite prismatic is designed as a hand instrument, better results are obtained by fixing the instrument on a light tripod. With the aid of a ball-and-socket device, the compass can be turned in a horizontal plane and clamped in any position.

For taking a reading, the compass is fixed on the tripod and centered over the station i. The compass is leveled. The object vane and the prism are raised.

When the needle comes to rest, the reading at which the hair line produced appears to cut the image of the graduated ring is noted. For other types of the survey, it is not usually used. The important parts and the construction of surveyor compass are similar to that of a prismatic compass except for the following points.

In a Surveyor Compass, the ring is divided into four quadrants and graduations are made from 0 to 90 degrees in each quadrant. The letter E and W are interchanged from their true position so that the bearing of a line may be read in the correct quadrant. In certain Surveyor Compass, the graduation may be made from 0 to degrees in anti-clock-wise direction with the zero at N.

Do you want to know more about the prismatic compass and surveyor compass? If your answer is yes, then you are at right place. Use of Prismatic Compass. Procedure of Survey on Prismatic Compass. Surveyor Compass.

Thanks for Reading this Article! Pin 1. Share

To help us find the correct distance we used a foot tape measure, with one person acting as an anchor and the other following the compass heading. When the person with the compass reached feet they would stop, wind the tape measure back up, and start over again. In the end, the survey . Compass surveying is the branch of surveying in which directions of survey lines are determined with Roto Tape Compass compass and the lengths of the lines are measured with a tape or a chain. In compass surveying the direction of survey line called Knobs And Pulls Hardware 90 the bearing of line is defined as the angle made by the line with the magnetic meridian. Compass survey is used when large area of site is involved. Usually, traversing survey is used in conducting compass survey. Traversing is that type of survey in which a number of connecting lines form the frame work and the directions and lengths of the survey lines Clamps Para Router Android are measured with the help of an angle measuring instrument and a tape.

Large Wooden Mallet Hammer Yoga Projects To Build In Java Jdk