Figure 6. 20 illustrates a commercially available fringe multiplication and fringe sharpening apparatus mounted on a polariscope specially designed to facilitate these applications.
At 345 kV, utilizing commercially available cable, practically all of the current carrying capability of the uncompensated underground conductor is utilized by this charging current in a distance of about 26 miles (41.6 km).
Specialized text edit controls are commercially available; you can purchase variants of the text-entry control that will only allow numbers or letters or phone numbers, or reject spaces and tabs, for example.
