The gap is the opening in the "C" shaped core of a magnetic read or write head. Magnetic lines of flux bridging the gap induce voltage in a read head or produce flux changes when using a write head. The gap length across the "C" is usually in the range of 12.7-51 um (0.0005-0.002"). The gap width determines the encoded track width on the magnetic stripe. Typically ISO gap width is between 2.54 mm and 3.18 mm (0.100-0.125") although some special purpose heads feature gap widths of 6.3 mm (0.25") or more. head- A magnetic head is an electronic component for reading or encoding magnetic information. It is composed of a core, winding, optional case and output terminals or leads. Read heads may be used for any coercivity stripe. Write heads must be designed to handle the anticipated coercivity; write currents are typically 5-100 mA peak-to-peak for low coercivity and 100-2500 mA peak-to-peak for high coercivity. Write current also depends upon the number of turns in the winding (inductance), core material etc.
Vertical slit in the core of a tape head. In the gap, a magnetic field occurs during recording, and a magnetic signal is induced during replay.
Gap, Incorporated is a San Francisco-based apparel and accessories retailer founded in 1969 by Donald Fisher and Doris Fisher. The Fishers opened their first shop because they had been frustrated with the lack of decent customer service and fashionable styles at other retailers. The name was derived from the growing differences between children and adults--namely "the generation gap"--which reached its peak with the hippie movement.