CLOCKS

(See also Atomic Clocks; Doomsday Clock; Watches [Timepieces])

astronomical (Old Town Hall, Prague): g03 11/8 22-23; g00 5/22 16-18

Big Ben (England): g 10/10 17-19

biological clocks: g90 6/8 15-16; g86 6/8 18-21

cells in eyes that set body clock: g02 11/22 31

human nap times: g90 10/22 29; g87 4/22 29; g87 7/22 29

in bamboo: g90 11/8 28-29

light-sensitive cells behind knees: g98 10/8 29

crystal-based:

accuracy using sapphire: g96 10/8 29; g88 2/8 29-30

Elephant Clock (13th century): g 11/12 27

longcase (grandfather) clocks: g 1/11 19

used in determining longitude: g 5/10 21-22

War Museum (London): g99 9/22 3; w96 9/15 32

water clock (clepsydra): w11 8/1 23