CLINOMETER COMPASS GEOLOGY PDF

History[ edit ] Drawing of an inclinometer, Museo Galileo, Florence. The glass face of the disc is surrounded by a graduated scale that marks the angle at which the surface of the liquid stands, with reference to the flat base. The zero line is parallel to the base, and when the liquid stands on that line, the flat side is horizontal; the 90 degree is perpendicular to the base, and when the liquid stands on that line, the flat side is perpendicular or plumb. Intervening angles are marked, and, with the aid of simple conversion tables , the instrument indicates the rate of fall per set distance of horizontal measurement, and set distance of the sloping line. Louis"—in Charles Lindbergh chose the lightweight Rieker Inc P Degree Inclinometer [1] to give him climb and descent angle information.

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Print Email The orientation of a dipping plane is most commonly measured using the contact method. The exact order that you complete the steps and obtain the strike and dip of the plane is not crucial; this will depend on the instrument used, fi eld conditions and personal preference. What is important is ensuring that you record the three pieces of information strike, dip magnitude and dip direction.

Note that the order of the steps in Figures is different to take account of the easiest way to measure a dipping plane with the different instruments. If this technique is new to you, or the reading seems unreasonable, or the bedding surface is not ideal, take a second or even third reading and use the average or the best one.

Determine the general direction of dip by looking at the plane or you can pour fluid over the bedding plane to see which way it runs. In some cases it may be necessary to smooth out the variations on the surface by placing a notebook or clipboard on the bedding plane, but take care to ensure that this is not biased by a small irregularity.

Hammer near left hand side shows the plane chosen in this case. Set the clinometer mode 2. Set the clinometer mode Prepare the compass-clinometer for the clinometer mode by setting the top of the clinometer part so that it is parallel to the long edge of the compass-clinometer i. Dip magnitude Place the long edge that is at the base of the clinometer scale on the bedding plane, with the long edge of the compass-clinometer parallel to where you estimate the maximum dip direction lies i.

While looking at the clinometer reading, carefully rotate the compass-clinometer device slightly as shown by the arrows to find the line of maximum dip. Read off the maximum dip. Note that the dip can be read from either side of the Silva-type compass-clinometer.

Strike direction The strike direction is exactly perpendicular to the dip direction, so remembering where the maximum dip lies, lift the compassclinometer and place the long edge of the compass-clinometer along the line of strike. Pivot the compass-clinometer window as shown by the red arrow until it is horizontal. Rotate the compass dial so that the compass needle lines up with the red outline for the north direction, checking that the compassclinometer is still horizontal.

Take the reading of the strike from the dial. Dip direction The last measurement is the direction of dip to the nearest cardinal point e. In this case it is E. Note that the strike is always recorded as a 3-digit number to avoid any confusion and that the degree symbols are not normally shown to prevent any confusion with zeros. Share to:.

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