. Robison's Manual of radio telegraphy and telephony for the use of naval electricians . Fig. 6. Fig. 7. as sliown in fig. 6. Some force connected with the magnet must makethe filings assume these positions, which are different from what theywould be if the magnet was not under the paper; and from the way thefilings are arranged, this force must act in the space surrounding themagnet. This space is called the field of magnetic force, or simply thefield of force, and the lines in which the filings tend to arrange them-selves are called the lines of force, and we shall see in chapter II that thi
. Robison's Manual of radio telegraphy and telephony for the use of naval electricians . Fig. 6. Fig. 7. as sliown in fig. 6. Some force connected with the magnet must makethe filings assume these positions, which are different from what theywould be if the magnet was not under the paper; and from the way thefilings are arranged, this force must act in the space surrounding themagnet. This space is called the field of magnetic force, or simply thefield of force, and the lines in which the filings tend to arrange them-selves are called the lines of force, and we shall see in chapter II that thisconception is used as a basis for electric measurements. The direction ofthe lines of force at any point indicates the direction of the magneticforce at that point, and their number in any area, the strength of thefield in that area. It is found that a small magnetic needle, pivoted so that it is free tomove and brought near the large magnet, will lie parallel to the direetionof the lines of force at any point at which it may be placed in the field, MANUAL OF RADIO TELEGRAPHY AND TE
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