Hough—Description of a Printing Chronograph. 439 
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_The train carrying the minutes and integer seconds will run 
eight hours; the gear for elevating the hammer will deliver 
2000 blows; and the train for moving the paper fillet will go 
1200 times without winding. The fast moving train runs one 
hour and thirty-six minutes ; but since this train can be stopped 
at pleasure, without changing the zero of the type, its compara- 
tively brief running is not a serious inconvenience. 
To recapitulate, we claim the following: 
t, Separate movements for the integer seconds and the 
hundredths of seconds; 2nd, The method of regulating the 
nary chron h. Three Grove elements, or six Hill's ele- 
ments, work the two electro-magnets well. A separate bat- 
tery of about the same size is used for the hammer and fillet 
ets. 
| __._In point of accuracy, this machine leaves nothing to be de- 
| _ Sired, and is much beyond what we thought possible. From a 
vast number of experiments, made by reco Aya Sc: 
the beats of the standard clock, both at the middle and end of 
the oscillation, the mean error for a single print is found to be 
about 0-018 sec., equal in this respect to the recording chrono- 
graph. The maximum difference in the records of the beats 
Seldom exceeds 0°03 sec. ; and we believe this is as much due 
to the irregularity in the clock connection as in the running of 
the machine, since the same thing is found in ordinary chrono- 
Saag where the measures are made from second to: 
Secon: 
‘During the building of the machine, which was accomplished 
istant, F 
_ Am. Jour. Sct.—Turrp Series, Vow. II, No. 12.—Dzc., 1871. 
29 
