The magnetic compass is an old Chinese invention, probably first made in China during the Qin dynasty (221-206 B.C.). Chinese fortune tellers used lodestones (a mineral composed of an iron oxide which aligns itself in a north-south direction) to construct their fortune telling boards.
Guide to Pennsylvania weather in April. The average maximum daytime temperature in Pennsylvania in April is a comfortable 17Â°C (63Â°F). The average night-time temperature is usually a cold 5Â°C (41Â°F). There are usually 7 hours of bright sunshine each day, which represents 55% of the 13 hours of daylight. Expect 95mm (3.7 inches) of rainfall across the whole of April with 11 days with some rain falling.
Daily low temperatures range from 38AÂ°38Ã¢ f TOÂ°42a, 42Ã¢ f FALLINGÂ°Below 31a 31Ã¢ FÂ°Or exceeding 48a 48Ã¢ f only. One day in Ten the month of april is characterized by, rising daily high temperatures with DAILYÂ°Highs ranging FROMÂ°53a 53Ã¢ f to 58a 58Ã¢ f, over THEÂ°Course of the month EXCEEDINGÂ°65a 65Ã¢ f or dropping below. 45a 45Ã¢ f only one day in tenver the course of April typical wind speeds vary from 1 mph to 16 mph (light air to moderate breeze), rarely exceeding 26 mph (strong breeze). The highest average wind speed of 10 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 16 mph (moderate breeze).