Abstract: A therapeutic tension applying apparatus for applying tensile stress on a persons neck and spine while traveling, the apparatus is attachable to a vehicle seat or a mounting surface such as a ceiling within a vehicle. The apparatus provides adjustable, variable tension for the user and further includes a break-away-means which allows detachment of the apparatus from a chin strap or pad so as not to endanger the user, such as in the case of an accicent.

Abstract: The offset of the attachment position of each drafting pen in a coordinate plotter can be measured by drawing, with a standard drafting pen different from the first-mentioned plural drafting pen, main scale line segments dividing a predetermined distance from a reference line equally into n divisions; drawing, from the position of the reference line and with the first-mentioned drafting pen, auxiliary scale line segments dividing the predetermined distance equally into n+1 divisions while causing the auxiliary scale line segments to overlap partly with the main scale line segments; and determining a position, where either one of the main scale line segments is coincided with either one of the auxiliary scale line segments. The method of this invention thus allows to adjust the offsets of drafting pens readily and accurately in a coordinate plotter.