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3000BCE, (with earlier predecessors) Cuneiform written on clay tablet with reed or stylus.
Cuneus – latin for ‘wedge’
Sinographs – difficult to date exactly, certainly by 1500BCE
Merchant’s son, possibly goldsmith probably cloth.
Financial trouble due to mirror scheme,
Early printing latin grammar books,
Printed ‘indulgences’ for the church
Problem with observing stars from rolling deck.
Edmund Halley suggested lunar occulations, not enough bright stars occulted by the moon.
Lunar Distance: Tobias Mayer, German astronomer & Leonard Euler  & Nevil Maskelyne  accurate tables, establishment of Greanwich Mean Time based on observatory at greewich
Cannot use pendulum clocks, roll, pitch & yaw + temperature, humidty, pressure, salt water.
John Harrision. Carpenter from yorkshire. Built first clock in 1713
5 protptype H1 – H5, winning design H-4
Based on
Prize required
Brother Ignace meember of assembly during revolution.
cross bar(reguator) : 4 angles
indicators: 7 positions
è7x7x4 = 196 symbols