438  Hough—Description of a Printing Chronograph. 
f the record is made while the type wheel indicating integer 
one number 
operation of this et allowing c~ fall and print. ihe 
a time - — mmer is about 0-07 sec., being but aa 
“€ in excess of our ordinary chronographic recording pen; 20 
Since the hammer is acted’ on by she alone, the armature 
if ‘ 
