OF METEOEOLOGICAL INSTRUMENTS. 



11 



FIG. 156. 



o 



FIG. 155. 



FIG. 153. 



FIG. 154. 



FIG. 149. 



148. THE ANEEOID BAEOMETER, of plainest form ; when well made is also perfectly 



adapted for this purpose (see also page 34) . . 1 10 to 2 10 



149. Plantation Barometer^. 149) (see also Nos. 180 and 182) 1 10 Oto 2 



PORTABLE OR PEDIMENT BAROMETER 1 . 



In these instruments the action of the mercury is direct and free from mechanical 

 influence ; and, when the relative proportions of the cistern and tube are properly 

 arranged on the barometer scale, the nearest approach to a standard barometer is 

 attained. 



150. Portable Barometer^ extra size, very bold, handsomely carved, in rosewood, 

 mahogany or oak, plate-glass in front, with extra large tube 0'45 inch internal 

 diameter, double rack- work, ivory plates, and attached thermometer, suited for 

 large halls or public buildings . 7 7 8 8 and 10 10 



