The Center's large digital
clock shows hour, minute, second and tenth of a second. An electronic
distributor relays impulses from the digital clock to the Swiss
clock network throughout the Fair. The digial unit is monitored
by an electrically driven master clock.
This master clock is, in
turn, monitored by a quartz clock, so-called because its extraoridnary
precision is derived from the vibrations of a quartz crystal
suspended in a near-vacuum. Ultimate checking of the three instruments
-- and subsequently of the tower clocks on the Fair site -- is
by the radio signal from the obsrvatories.
Sidereal (star), solar
and mean time are registred on other Time Center instruments.
A giant plexiblas map shows time throughout the world.
The three Swiss firms that
supplied Time Center equipment are: Ebauches, S.A.; Favag, S.A.;
and Patek Philippe & Cie, S.A.