▁degrees ▁F ahren heit ▁( 3 . 3   K ) ▁over ▁the ▁course ▁of ▁each ▁day ▁creates ▁approximately ▁enough ▁pressure ▁to ▁raise ▁a ▁one - p ound ▁weight ▁by ▁one ▁in ch ▁( equ ivalent ▁to ▁ 0 . 1 1 3 ▁J ou les ▁or ▁ 3 1 ▁ μ Wh ), ▁which ▁drives ▁the ▁clock ▁mechanism . ▁ ▁A ▁similar ▁mechanism ▁in ▁a ▁commer cially ▁available ▁clock ▁which ▁oper ates ▁on ▁the ▁same ▁principle ▁is ▁the ▁At mos ▁clock , ▁which ▁is ▁manufact ured ▁by ▁the ▁Swiss ▁watch maker ▁Ja eg er - Le C ou ltre . ▁ ▁While ▁the ▁clock ▁has ▁not ▁been ▁w ound ▁since ▁it ▁was ▁made ▁by ▁Arthur ▁B ever ly ▁in ▁ 1 8 6 4 , ▁it ▁has ▁stopped ▁on ▁a ▁number ▁of ▁occasions , ▁such ▁as ▁when ▁its ▁mechanism ▁needed ▁clean ing ▁or ▁there ▁was ▁a ▁mechanical ▁failure , ▁and ▁when ▁the ▁Physics ▁Department ▁moved ▁to ▁new ▁qu arters . ▁ ▁As ▁well , ▁on ▁occasions ▁when ▁the ▁ambient ▁temperature ▁has ▁not ▁fl uct u ated ▁sufficiently ▁to ▁abs orb ▁the ▁requ is ite ▁amount ▁of ▁energy , ▁the ▁clock ▁will ▁not ▁function . ▁However , ▁after ▁environmental ▁parameters ▁read just , ▁the ▁clock ▁begins ▁operating ▁again . ▁ ▁See ▁also ▁Long - term ▁experiment ▁Oxford ▁Electric ▁Bell ▁( 1 8 4 0 ) ▁P itch ▁drop ▁experiment ▁( 1 9 2 7 ) ▁C ox ' s ▁time pie ce ▁C lock ▁of ▁the ▁Long ▁Now ▁ ▁Tem per ature ▁gradient