54. G. W. Hough on an Automatic printing Barometer. 
<a. { 
June 26th. Bar. 29°68. Cloudy, a heavy shower of rain fol- _ 
P.M. A violent — 
gale of wind 150 miles to the east, about midnight. 
July 16th. Bar. 29°81 Rain 
. Rain. 
July 26th. Bar. 29°60, Cloudy, light breeze from south. 
Aug. 4th. Bar. 29-94in, Heavy showers from 6 to 10 P. mM. 
Aug.12th. Bar. 29-72», Clear and pleasant. 
Aug.16th. Bar. 29-73%. eerste between 6 and 8 P. M. 
ain. 
Oct. 18th. Bar. 30:04'", Cloudy with somerain. A violent 
gale of wind on the night of the 19th; most severely felt along 
the eastern coast. The observations of the 17th and 18th of 
October were made at New York city. At 14® the weight for 
driving the mechanism rested on the floor. The barometer at 
9 a. M. of the 19th stood at 29°40in, 
ne. great advantage in the use of this instrument consists in 
the ease with which it may be manipulated. All the adjust- 
ments are simple and easily accomplished. Any person could 
learn, in a few days at most, to keep it in running order, and 
make any adjustments, should it become necessary from accident 
or other causes. No chemicals are needed, except the sulphate 
for the battery, which may readily be procured in any 
town or village. Every part of the action is visible to the eye | 
of the observer, so that in case any part gets out of order, it will 
readily be seen. * 
The screw S, on which the accuracy of the results will ina 
great measure depend, is, as before remarked, 50 threads to the _ 
inch, and was cut by Mr. Charles Fasoldt; and is found to bea — 
very perfect one. , 
_ Numerous experiments have been made to test the stability — 
of the float and magnetic connections, It will hardly be neces- — 
sary to give the results in detail. In case there was no friction — 
of any kind, the float ought always to assume the same position — 
for the same height of the mercurial column. The following is 
he test we have applied. The electrical contact being broken 
by the key , fig. 3, the screw S was turned so as to force the 
