Compass has a half-life of only about 12 years, so a compass that contains 120 mCi of tritium when new will contain only 60 when it is 12 years old, 30 when it is 24 years old, and so on. Consequently, the illumination of the display will fade. Mariners' compasses can have two or more magnets permanently attached to a compass card, which moves freely on a pivot. A "lubber line", which can be a marking on the compass bowl or a small fixed needle, indicates the ship's heading on the compass card. Traditionally the card is divided into thirty-two points
The Broken Compass The Broken Compass The Broken Compass: How British Politics Lost its Way is the fourth book by British writer Peter Hitchens, published in May 2009. Polemical and partly autobiographical, the book contends that the British political right and left no longer hold firm, adversarial beliefs, but vie for position in the centre, while at the same time overseeing a general decline in British society. Hitchens depicts the right in particular as a confused and spent political force that has been subsumed by the centre-left, itself a product of Fabian social democracy. As a result of these factors, "there is no