XV1 INTRODUCTION TO THE MAKERSTOUN OBSERVATIONS, 1847 To 1855. 
Newman’s standard. On June 20, 1853, Newman’s standard was returned from 
the Kew Observatory with the following Table of corrections :— 



Corrections to be Corrections to be 
Temperature. | 2PPplied to the read- Temperature. applied to the read- 
Fahr, ings of Newman’s Fahr, ings of Newman’s 
Standard. - Standard. 
° ° ; 
32 — 0-05 60 — 0°52 
36 —0:10 63 — 0-59 
40 —0°15 67 — 0:67 
45 — 0-16 70 —0°74 
50 — (027 76 — 0°87 
55 — 0°40 79 —0:92 

On August 11, 1857, the wet and dry bulb thermometers were compared 
with Newman’s standard in the running stream of the Tweed, and the tempera- 
tures were as follows :— 
Newman’s Standard, 64°3 ; dry bulb, 64°°75 ; wet bulb, 64°35. 
Taking everything into consideration, the following Table of corrections has 
been ‘drawn out as applicable to the readings of the wet and dry bulb thermo- 
meters from 1847 to 1855 :— 
TABLE of Corrections applicable to the Wet and Dry Bulb Thermometers. 



Temperature. | Dry Bulb. Wet Bulb. Temperature.| Dry Bulb. Wet Bulb. 
0°F. —0°5 —0:2 55° F. —1-1 — 0:8 
—0°6 —0°3 60 —1:2 —09 
—0°7 —0°4 67 —1:1 —0°8 
—0°8 —0°5 70 —1-0 —0°6 
—0:9 —0°6 76 —1:0 —0°7 
—1:0 —0-7 79 Dey —0°7 

RAIN GAUGE. - 
The Observatory rain gauge is placed in a space enclosed by a paling on the 
top of the Observatory hill, with a good exposure on all sides. -The funnel-mouth 
is 6:1 inches in diameter, 8 inches above the soil, and 218 feet above the level of 
the sea. The quantity of rain is measured at noon by pouring it into a glass tube 
graduated with reference to the aperture of the funnel. 
VANES AND ANEMOMETER. 
A detailed description of these instruments will be found in the Introduction 
1845-46, p. lvill. 

