ON THERMOMETER STANDS. 
263 
some touching a wall, others distant from it; and some in the angle of a high building (cool as a cellar), 
and others exposed to the rays of the sun at one or other hour during the day. 
“ The Lawson Meteorological Thermometer Stand,” which we shall describe (leaving Mr. Glaisher’s 
stand for a future paper), is so arranged that it may he placed in any eligible situation ; it commands a 
true north and south aspect; the instruments can he read off with the greatest facility, and they will he at 
a known distance from 
the ground; the instru¬ 
ments on the south face 
will have the meridian 
sun, and those on the 
north face will he al¬ 
ways in the shade. The 
instrument is not costly, 
and were this stand 
universally adopted, ob¬ 
servations, whether re¬ 
corded here or at the 
antipodes, could he 
compared with each 
other with far less 
chance of error than 
has hitherto been the 
case. 
Figure 1 is a view of 
the stand. It is com¬ 
posed of white deal 
hoards, and can be con¬ 
structed by any carpen¬ 
ter. It consists of an 
oblong trunk T, twelve 
inches by eight inches 
outside measure, to the 
opposite sides of which trunk are nailed boards, b b, at the distance of three-quarters of an inch, and pro¬ 
jecting about six inches from the trunk towards the north. Outside of these are nailed other thin boards, 
c c, fall half an inch distant, and projecting about four inches beyond the last mentioned boards, also 
towards the north. These sides being thus multiple, prevent the sun from heating the interior of the 
stand, where the thermometers are placed. The top, or pent-board, P, is made double, and the boards 
are placed fully three-quarters of an inch distant from each other, and come so forward as to overhang 
by a full inch. The legs, L L, of the stand are merely the continuation of the sides of the trunk. The 
board, or feet, F F, are loaded or fixed to the ground to sustain the force of the wind. The interior, 
T, is blackened to prevent strong reflections of light. 
Figure 4 is a ground plan, or bird’s-eye view of the machine 
are of three-quarter-inch white deal. The distance or space be¬ 
tween the sides of the trunk, T (fig. 1), and the board, or inner 
bide, (fig. 4), is three-quarters of an inch; and, the distance from 
that board to the outer side (fig. 4), is full half an inch. Tlienar- 
row boards (fig. 4), are to be nailed, with studs intervening, to 
the middle board or side, and are for the purpose of preventing 
the sun from shining between the trunk and the sides of the 
stand, when near the meridian. The sides are fixed one upon 
another at the required distance (viz., three-quarters of an inch 
and half an inch), by numerous wooden studs, partially shown 
at figs. 1 and 2, about three-quarters of an inch diameter, and 
the screws passed through the sides and studs, fixing the whole 
firmly together. The whole is to be painted white, except the 
trunk T, which should be black. 
Figure 2 is the view of the north side of the stand. No. 1 is an Index Thermometer to give the 
greatest cold of the night. The thermometer inclines, the ball end being the lowest, in order that the 
The sides and wood-work generally 
Fig. 4. Hi 
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