440 The Smithsonian Institution 



ir passes throug 







as have ceeii ccscriDcci tarougn cnc v. 

 represent nearly two hundred lines, 

 shown in the plate in the usual form as 

 oincidencp of the twc 



' ^-'-^of that could 



e old one. But this new method 

 t it ran record more mir 

 than .i •. 'se inflections ^nally 



sli ven. 



Vv ncj we proc' ith the aim of de 



inute deflections that are caused by the chang 



-. - . „--i and the earth, we are confrn- 



the dui. ■ -■ ■-- to delicate physical men ■ 



kiiiu ' nsitiveness of our apparatus, 



..■•a 



itself, the disr 



reet reeist. ._ their .: 



M' " ■ bu.::e manner. 



