X. MISCELLANEOUS. 603 



thermometer. The thermometer box is to be placed over a plot of grass, and 

 in a free open space to which the sun's rays have free access during as much 

 of the day as surrounding conditions enable the observer to secure. The 

 thermometers are suspended on cross-laths in the centre of the box, and face 

 the door, which should open to the north. 



Designed by Thomas Stevenson, C.E., F.R.S.E., Honorary Secretary, and 

 described in the Society's Journal, vol. i., p. 122. 



2942. Apparatus, by (t Baudin," for observations at sea, with 

 maxima air-bubble thermometer of " Walferden," and minima 

 vertical thermometer of " Baudin," withdrawn from external 

 pressure. M. Baudin^ Paris. 



2 942 a. Model, illustrative of Meteorological Sections of the 

 atmosphere. Scottish Meteorological Society, Edinburgh. 



Showing vertical gradient for temperature, pressure, humidity, &c., ascer- 

 tained by dividing the difference of readings between the instruments at* the 

 two heights by the height between them. Designed by Thomas Stevenson, 

 C.E., F.R.S.E., Honorary Secretary, described at a general meeting of the 

 Society, and published in " Nature." 



