HISTORY AND PROGRESS. 



81 



thence over the terminals of the alarm, through the line, to 

 the alarm of the distant station, which it rings or not, 

 according as the contact peg is out or in, through the indi- 

 cator coils, moving its pointer simultaneously and corre- 



Fig. 43. 



spondingly to the movements of the first indicator, and, 

 finally, to earth a short circuit over the coils of T being 

 established when the handle stands at zero of the dial. 



The older forms of the apparatus were a little clumsy and 

 noisy in manipulating; but the vast improvements made 

 lately in its construction in the London establishment of 

 Messrs. Siemens Brothers have reduced these inconveniences 

 to a minimum, without in the least lessening the power or 

 trustworthiness of its indications. It is spoken very highly 

 of by the employes, and may be looked upon as one of the 

 best existing pointer telegraphs. 



