LL. Waldo— Papers on Thermometry. 57 
center of reference, we do not intend to say that the buildings 
swayed equally with the pendulum, for, as is clear, the motion 
in one of the semi-undulations is not a ‘ect of the impulse 
or inclination of the edifice, but of the weldbity acquired in the 
first semi-oscillation. The divergences of the pendulum on 
d 
points more or less detent from the place of observation. 
Nore 2.—The figures have many lines that do not combine 
regularly with the rest. This has resulted from the shocks 
ent way and forcing it sometimes to abandon one curve in 
order to follow another started by the new impu 
In conclusion, we assure our readers that A or curves as pre- 
sented in the figures were transferred from the lycopodium 
powder with the greatest possible fidelity. 
These figures have been copied for this Journal by photogra- 
phy, in mend that they might be a correct transfer from the 
original plate. he ah 1 and 5 are of the same size as on the 
original Linen 2, 3, 4, have been eeacead one-half.— Eps 
— 
Art. VI.—Papers on Thermometry from the Winchester Observa- 
tory of Yale College; by LEONARD WALDO. 
1— On the Errors of the Kew Standards, 578, 584 and 585. 
order to avoid, as far as possible, any uncertainty as to 
what constitutes the mercurial standard thermometer to which 
the instruments sent here are referred, the following definition 
of this standard has been adopted and is printed upon the cer- 
tificates of examination issued with standard thermometers 
sent here to be verified.* 
“The theoretical mercurial stindard thermometer to _ this instrument has 
been referred, is graduated by equal Meee pi upon a glass stem of the sam n 
sions and chemica 1 constitution as etic wal w standards 578 fete 584. The permanent 
freezi is determined by an a not less than 48 hours to melting’ 
ice, supposing the temperature of page standard has not been greater than 25° C, 
= 77° F. during os @ prece <1 air fe months. a boiling point is determined from 
the temperature 0 f the ste ofp re water at a barometric pressure of 760™™ 
= 29°9216 in. (reduced to 0° °C. ) at ‘the level "of the sea and in the latitude of 45°.” 
* Th w thermometers are supposed to have their boiling points as nearly as 
Practicable wh 212° F. = 100° ©. at the temperature of steam under Laplace’s 
Standard atmospheric or or the atmospheric pressure weir Sopot’ to the 
following number of inches in the barometric reading, reduced to 32° F., 
29° ots + 0°0766 cos 26 + 0°00000179 H, 
Where ¢ = the Reo and H is ' the ay in feet above the sea gees 2 
Br. Ass. Ady. Sei. 1854, p. xxii 
