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Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Starting at point A, you draw the meridian line lightly. Then you lay off AO, 10 inches or any convenient round-figure length along the referenced meridian. Draw a light line OP as shown. Find the distance OP as follows:. You know that OP is equal to 4. Remember that unless you are plotting a closed traverse, it is always advantageous to start your offsets from the referenced meridian.
The reason is that, after you have plotted three or more lines, you can always use this referenced meridian line for checking the bearing of the last line plotted to find any discrepancy. The bearing angle, used as a check should also be found by the same method tangent-offset method.
To plot the direction of line BC in figure , draw a light perpendicular line towards the right from point B. The remaining sides, CD and DA, are plotted the same way. The spirit of man is illumined by the Sun of Righteousness, and chaos becomes cosmos.
This growth is gradual. Three stages of Christian growth. God calls, touches, blesses; which corresponds in some sort to assent, affiance, and assurance. Growth in religion is mainly characterised by thought of ourselves at its beginning, by consideration for others as we advance in holiness, and by a desire for the glory of God when more matured. Is Christ growing in us? We must be advancing or receding. The magnitude of the coil's field is:.
One problem with the tangent galvanometer is that its resolution degrades at both high currents and low currents. A tangent galvanometer can also be used to measure the magnitude of the horizontal component of the geomagnetic field. When used in this way, a low-voltage power source, such as a battery, is connected in series with a rheostat , the galvanometer, and an ammeter. The galvanometer is first aligned so that the coil is parallel to the geomagnetic field, whose direction is indicated by the compass when there is no current through the coils.
The battery is then connected and the rheostat is adjusted until the compass needle deflects 45 degrees from the geomagnetic field, indicating that the magnitude of the magnetic field at the center of the coil is the same as that of the horizontal component of the geomagnetic field. This field strength can be calculated from the current as measured by the ammeter, the number of turns of the coil, and the radius of the coils. Unlike the tangent galvanometer, the astatic galvanometer does not use the Earth's magnetic field for measurement, so it does not need to be oriented with respect to the Earth's field, making it easier to use.
Developed by Leopoldo Nobili in ,  it consists of two magnetized needles parallel to each other but with the magnetic poles reversed.
These needles are suspended by a single silk thread. The purpose of the second needle is to cancel the dipole moment of the first needle, so the suspended armature has no net magnetic dipole moment , and thus is not affected by the earth's magnetic field.
The needle's rotation is opposed by the torsional elasticity of the suspension thread, which is proportional to the angle. To achieve higher sensitivity to detect extremely small currents, the mirror galvanometer substitutes a lightweight mirror for the pointer.
It consists of horizontal magnets suspended from a fine fiber, inside a vertical coil of wire, with a mirror attached to the magnets. A beam of light reflected from the mirror falls on a graduated scale across the room, acting as a long mass-less pointer.
The mirror galvanometer was used as the receiver in the first trans-Atlantic submarine telegraph cables in the s, to detect the extremely faint pulses of current after their thousand-mile journey under the Atlantic. In a device called an oscillograph , the moving beam of light is used, to produce graphs of current versus time, by recording measurements on photographic film.
The string galvanometer is a type of mirror galvanometer so sensitive that it was used to make the first electrocardiogram of the electrical activity of the human heart. A ballistic galvanometer is a type of sensitive galvanometer for measuring the quantity of charge discharged through it. It is an integrator , by virtue of the long time constant of its response, unlike a current-measuring galvanometer.
The moving part has a large moment of inertia that gives it an oscillation period long enough to make the integrated measurement. It can be either of the moving coil or moving magnet type; commonly it is a mirror galvanometer.
From Wikipedia, the free encyclopedia. Instrument to measure electric current. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.
Unsourced material may be challenged and removed. Main article: Mirror galvanometer. Main article: Ballistic galvanometer. Page National High Magnetic Field Laboratory. Retrieved 17 October The story of electrical and magnetic measurements: from B.
John Wiley and Sons. Retrieved 25 April Comptes rendus in French. Kenyon College. Retrieved 26 April
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