386 POPULAR LECTURES AM) ADDRESSES. 



balance-wheel whether it will go faster or slower 

 than its proper rate. If, when hung on a nail and 

 set to swing, it vibrates more rapidly than the 

 balance-wheel, then the effect of the hanging 

 would be to induce a slower rate ; but if when set 

 to swing it vibrates slower than the balance-wheel, 

 then when left to itself it will go faster than when 

 the case of the watch is held quite fixed. A 

 watch regulated to go correctly when hanging on 

 a nail (according to a faulty practice, sometimes 

 followed, he believed, in watchmakers' shops) 

 cannot be expected to go at even approximately 

 the same rate as when carried about in ordinary 

 use. 



