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Hawkins Electrical Guide v. 03 (of 10): Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications — John Shaqi

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Hawkins Electrical Guide v. 03 (of 10): Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

Name: Hawkins Electrical Guide v. 03 (of 10): Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications
Author: Hawkins, N. (Nehemiah)

Hawkins, N. (Nehemiah)

Electrical engineering -- Handbooks, manuals, etc.

Ans. In using the instrument, after the needle has been set to zero,
the current is sent through the coil, producing a deflection of the
needle. The coil is then rotated to follow the motion of the needle, the
current being kept constant, the rotation being continued until the zero
on the upper dial again registers with the needle. The current then is
proportional to the sine of the angle through which the coil has been
turned, as determined by the lower dial.

Ques. Has the sine galvanometer a large range?

Ans. For a given controlling field, it does not admit of a very large
range of current measurement, since, for large deflection, on rotating
the coil the position of instability is soon reached.


TABLE OF NATURAL SINES AND TANGENTS

 Angle|   Sin.|   Tan.|
    0°|  .0000|  .0000|
|  .0175|  .0175|
|  .0349|  .0349|
|  .0523|  .0524|
|  .0698|  .0699|
|  .0871|  .0875|
|  .1045|  .1051|
|  .1219|  .1228|
|  .1392|  .1405|
|  .1564|  .1564|
   10°|  .1736|  .1763|
|  .1908|  .1944|
|  .2079|  .2126|
|  .2250|  .2309|
|  .2419|  .2493|
|  .2588|  .2679|
|  .2756|  .2867|
|  .2924|  .3057|
|  .3090|  .3249|
|  .3256|  .3443|
   20°|  .3420|  .3640|
|  .3584|  .3839|
|  .3746|  .4040|
|  .3907|  .4245|
|  .4067|  .4452|
|  .4226|  .4663|
|  .4384|  .4877|
|  .4540|  .5095|
|  .4695|  .5317|
|  .4848|  .5543|
   30°|  .5000|  .5774|
|  .5150|  .6009|
|  .5299|  .6249|
|  .5446|  .6494|
|  .5592|  .6745|
|  .5736|  .7002|
|  .5878|  .7265|
|  .6018|  .7536|
|  .6157|  .7813|
|  .6293|  .8098|
   40°|  .6428|  .8391|
|  .6561|  .8693|
|  .6691|  .9004|
|  .6820|  .9325|
|  .6947|  .9657|
|  .7071| 1.0000|
|  .7193| 1.0355|
|  .7314| 1.0724|
|  .7431| 1.1106|
|  .7547| 1.1504|
   50°|  .7660| 1.1918|
|  .7771| 1.2349|
|  .7880| 1.2799|
|  .7986| 1.3270|
|  .8090| 1.3764|
|  .8192| 1.4281|
|  .8290| 1.4826|
|  .8387| 1.5399|
|  .8480| 1.6003|
|  .8572| 1.6643|
   60°|  .8660| 1.7321|
|  .8746| 1.8040|
|  .8829| 1.8807|
|  .8910| 1.9626|
|  .8988| 2.0503|
|  .9063| 2.1445|
|  .9135| 2.2460|
|  .9205| 2.3559|
|  .9272| 2.4751|
|  .9339| 2.6051|
   70°|  .9397| 2.7475|
|  .9455| 2.9042|
|  .9511| 3.0772|
|  .9563| 3.2709|
|  .9613| 3.4874|
|  .9659| 3.7321|
|  .9703| 4.0108|
|  .9744| 4.3315|
|  .9781| 4.7046|
|  .9816| 5.1446|
   80°|  .9848| 5.6713|
|  .9877| 6.3138|
|  .9903| 7.1154|
|  .9925| 8.1443|
|  .9945| 9.5144|
|  .9962|  11.43|
|  .9976|  14.30|
|  .9986|  19.08|
|  .9994|  28.64|
|  .9998|  57.29|

Ques. What is the position of instability?

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Hawkins Electrical Guide v. 03 (of 10): Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

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