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.
The weather continues to get better in April in London, UK when spring is in full bloom. This month is characterised by rising daily temperatures, with average daily highs increasing from 13Â°C on April 1 st up to 16Â°C by April 30 th, rising above 21Â°C or falling below 10Â°C very rarely â only one day out of every ten.aily low temperatures change in a similar fashion, ranging from 7Â°C at the beginning of the month, up to 9Â°C in the final few days, falling below 4Â°C or exceeding 12Â°C only one day out of every ten. Across the whole month, the average temperature for April is a cool 9Â°C.