Most storage devices that do not require vision and a brain to read data fall into this category. Electromagnetic data may be stored in either an analog data or digital data format on a variety of media.
Direct Tripwire Alarm - The wire placed across the path is directly connected with the cord, wire or string placed across the particular path. Laser Tripwire Alarm - An invisible laser, typically an infra-red, is used instead of a cord or string.
Insert coil spring of adequate length in the archwire and tieligature wire on bracket of tooth on one side of coil spring(Fig. 1).2. Engage an elastomeric ligature into the other end of the coilspring (Fig. 2).3.