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  Main » Companies & Business » Management & Administration
   
 

Atomic Clocks

   
Author: Richard Romando
 

< P > T i m e w a i t s f o r n o m a n . K e e p i n g t h i s m i n d , w e s e t a b o u t i n v e n t i n g c l o c k s t o s y n c h r o n i z e o u r s e l v e s w i t h l u n a r c y c l e s . I t w a s a n i m p r e s s i v e l e a p , b e g i n n i n g s o m e 1 0 , 0 0 0 y e a r s a g o w h e n t h e E g y p t i a n s c a m e u p w i t h s u n d i a l s i n 2 1 0 0 B C . S u n d i a l s , o r s h a d o w c l o c k s , f i r s t u s e d b y S u m e r i a n s , w o r k e d o n t h e p r e m i s e o f m e a s u r i n g t h e l e n g t h o f s h a d o w s t o d e d u c e t i m e o f d a y . W e a t h e r p l a y e d s p o i l s p o r t a s o n c l o u d y d a y s , a n d w h e n t h e m o n t h s c h a n g e d , s h a d o w s w o u l d n o t c o r r e s p o n d w i t h t h e m a r k i n g s . T h e R o m a n s t r i e d t o d o b e t t e r b y p i l f e r i n g C l e o p a t r a s N e e d l e s , t h e t o o l s u s e d b y E g y p t i a n s , b u t h a d t o b e c o n t e n t w i t h t o w n c r i e r s a n n o u n c i n g t h e c h a n g i n g t i m e . A r o u n d 3 2 5 B C , t h e w a t e r c l o c k f o l l o w e d s u n d i a l s ; a w a t e r c l o c k w a s b a s i c a l l y a b u c k e t o f w a t e r w i t h a h o l e i n b o t t o m t o r e c o r d s l i p p i n g t i m e b u t n o t h o u r s . V a r i o u s c o n t r a p t i o n s a n d m o d e l s f o l l o w e d , u l t i m a t e l y r e s u l t i n g i n c l o c k s . < / P > < P > T h e w o r d c l o c k h a s i t s g e n e s i s i n F r e n c h w o r d " " c l o c h e , " " m e a n i n g b e l l . T h e f i r s t c l o c k u s e d w e i g h t s t o m o v e g e a r s , w h i c h i n t u r n m o v e d t h e h a n d s . T h e o n e p r o b l e m w a s t h a t s o m e o n e h a d t o r e s e t t h e w e i g h t s u n t i l w e i g h t w a s p r o p p e d b y a n o s c i l l a t i n g h o r i z o n t a l b a r a t t a c h e d t o v e r t i c a l s p i n d l e w i t h p r o t r u s i o n s t o a c t a s d i v e r s i o n s . S o o n , s p r i n g s r e p l a c e d w e i g h t s , r e d u c i n g t h e s i z e o f t h e c l o c k s t h a t c o u l d b e c a r r i e d , k e p t o n a m a n t e l p i e c e , o r h u n g a s w a l l c l o c k s . M e c h a n i c a l c l o c k s a n d w a t c h e s g a v e w a y t o e l e c t r o n i c t i m e p i e c e s w i t h q u a r t z c r y s t a l , l a t e r t o b e s u r p a s s e d b y a t o m i c c l o c k s . < / P > < P > A c c u r a c y i s t h e h a l l m a r k o f a t o m i c c l o c k s , w h i c h a r e t u r n i n g o u t t o b e m o r e r e l i a b l e a n d u n i f o r m w h e n c o m p a r e d w i t h t i m e d e d u c e d b y t h e r o t a t i o n o f e a r t h . A t o m i c c l o c k s o p e r a t e b y m e a s u r i n g t h e r e s o n a n t f r e q u e n c y o f a g i v e n a t o m i . e . , C e s i u m , H y d r o g e n , o r M e r c u r y , i n c r e a s i n g e x a c t n e s s m o r e t h a n a b i l l i o n t h o f a s e c o n d p e r d a y . I t i s t h i s a c c u r a t e n e s s t h a t h a s m a d e a t o m i c c l o c k s m o r e d e p e n d a b l e a s a l a r m c l o c k s f o r d o m e s t i c , s c i e n t i f i c , o r p u b l i c f u n c t i o n s . < / P >

 
 
 

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