We offer survey and drawing instruments like telescopic levelling staves, natioanl ceylon ghat tracer, natioanl plane table outfit, national bruton. The Ceylon ghat tracer. The first three forms are more commonly used and are explained in this chapter: a. Abney’s Level (Fig. ). It is the most commonly. ries offers a wide range of Ceylon Ghat Tracer (Ghattracer) to our customers as per their requirements and to the full satisfaction of them. A reliable .

Author: Nek Dait
Country: Anguilla
Language: English (Spanish)
Genre: Politics
Published (Last): 10 June 2017
Pages: 192
PDF File Size: 12.80 Mb
ePub File Size: 20.75 Mb
ISBN: 341-8-49136-614-9
Downloads: 53680
Price: Free* [*Free Regsitration Required]
Uploader: Mikazshura

Sight vane is a T-shaped staff on which is marked the height of the axis of the suspending tube above the foot of the suspending staff. The pencil can be lifted off the paper by means of a lever xeylon to the cord when tracing point runs over blank spaces. Copyright Jupiter Infomedia Ltd. Your use of this website is subject to and constitutes acknowledgement and acceptance of our Terms of Use.

The original plan is placed below the tracing point and a drawing sheet on which new plan is to be obtained under the pencil. The instrument is supported on several small rollers so that it remains parallel to the surface of the paper and can move freely in all directions. When the weight is kept on the long arm AC, erect copies are produced, while reverse copies are produced, if the weight is kept on the short arm DF and the pencil on the long arm AC, the divisions to the left being used during the operation.

On one face of the instrument are marked, a scale for lines on side of the slot and a scale for rations of circles on the other.

Top 4 Instruments Used in Land Surveying |Land Surveying | Surveying

When the sliding weight is ghxt at centre so that the index touches the zero of the scale, the line of sight is horizontal. Please make sure that you’ve entered a valid question. We don’t know when or if this item will be back in stock. As shown in the figure the instrument is set for reduction. Also we may bisect the brighter object out of the two by reflection. Now the line of tracre is horizontal but the bubble is out of the centre. Need GST Invoice on this product?


MM Industries Ceylon Ghat Tracer: : Industrial & Scientific

The bar is parallel to the tube and is at a distance of 2 to 3 cm from it. If not, the instrument is ceyln of adjustment.

Mark these points on the corresponding square lines on the new sheet by transferring the distances by scaling or by judging by eye. The eye-vane has a pin-hole while the object- vane has a long vertical slit. The reading on the left side of the slit gives the vertical angle angle of elevation or depression in degrees and that on the right side of the slit gives the value of the tangent of the corresponding angle.

The angles of elevation and depression and the reduced levels of points are determined as follows: The four arms are so arranged as to form a parallelogram having all sides equal.

Top 4 Instruments Used in Land Surveying |Land Surveying | Surveying

It is essential that index arm of should read zero on the graduated arc when the plane of the horizon glass is parallel to the plan of the index glass. Audible Download Audio Books. Would you like to tell us about a lower price? The left side of the vertical slit is graduated in degrees from the centre upwards for angles of elevation, and downwards for angles of depression, and the right side of the slit is graduated in natural tangents of the corresponding angles on the left.

It is one of the most precise hand instruments yet devised for measuring angles. Repeat the process to establish the next point. To prove that the angle between the mirrors i. The horizon glass should be at right angles to the sextant plane. Then move the tracing point along the lines on the original plan, when a reduced plan will be drawn by the pencil on the sheet beneath it. Now in order to directly read the angle between the objects, the graduation on are A-B arc plotted on twice the natural scale.

The instrument is in correct adjustment if the line joining the eye-hole and the zero of the scale is horizontal when the bubble is central. Permissions beyond the scope of this license may be available at jimtrade.

If it is to be used for enlarging a plan interchange the tracing point and the pencil. To test it establish a distant point at the same level as the eye-hole with a level or theodolite, and find whether the line of sight passing through the zero of the scales strikes it.


Shopbop Designer Fashion Brands. With right hand, turn screw S until the other object reflected from the index glass I appears upon the upper silvered portion of the horizon glass. When the instrument is correctly set, the tracing point, the pencil point and the fulcrum will be in one straight line as shown by dotted line in the figure, and will remain so far all positions of the instrument. Product information Technical Details.

Share your thoughts with other customers. This article throws light upon the four main instruments that are used in land surveying. The line joining the eye-hole and the intersection of the cross-wires furnishes the line of sight.

Have one to sell? Let I be the index glass fixed to the index arm IA which terminates into a vernier V capable of moving along the graduated arc A-B. It consists of two similar brass arms with sharp points at ends and longitudinal slots in the fhat. This is a simple, compact hand instrument used for locating contours, taking cross-sections etc.

It measures angle of elevation or depression and their tangents. The line joining the pin-hole and the intersection of the cross-wire is the line of sight. Number and letter each line both ways as shown in fig. For any inclination of the tube, the ghzt tube remains horizontal and the vernier arm vertical.

The index glass along with the index arm can be turned and fixed in any suitable direction. In this position, the bubble tube is horizontal while the telescope is parallel to the slope of the ground.

Ceylon Ghat Tracer

Move the slider until the index line coincides exactly with the division marked with a number representing the given ratio, say 3 on the scale of lines. The reading at the arc gives the required angle. The horizon glass, the lower half is unsilvered and upper half is silvered.