Dida, 
TRANSACTIONS OF THE SECTIONS. 15 
a plate of copper, in order to get a number of copies printed. The only attendance 
the instrument now requires, is to put a fresh paper upon the cylinder, by means of 
stretching-screws fixed on one side of it, cence a week, when I wind the time-piece up. 
i 
i A ) 
— 
i 
Let 
Mii] 
Tabulated results for the year 1847, taken from tracings by the instrument described. 
General mean of whole year .........sscseseensscees 47°89 
oe TIRE ash exiapsinsake sss soiusss os 36°61 
ANDY Hides scaenatcaraclcicsssss ees 44°13 
JULY; itatapesasssccscsess peace es ona 61°80 
a October .........44. Saakiteaxs dasa 49°35 
Highest single observation, 1st of August...... +. 80°00 
__A, copper bar, one inch in diameter and ten feet long. B, cast iron trough, to 
