OF METEOROLOGICAL INSTRUMENTS. 39 



FIG. 136. 



FIG. 144. FIG. 143. 



BAROMETERS. 



Besides the standard instruments as most of those described in the preceding pages, 

 the following are those most employed by the farmer, mariner, etc., as well as for 

 'weather glasses for ornamental and general use, a few forms and arrangements only 

 are given, but they may be had of any design to correspond with the architecture 

 of halls, libraries, and public buildings, perfect efficiency in the cheapest as well as the 

 most costly being the first consideration, few things keeping nature's laws better before 

 us than such efficient means of seeing and estimating the varying condition of the 

 pressure and heat of the atmosphere. 



MARINE BAROMETERS AND S Y M PI ESO M ETE RS. 



The great change effected in the use of these instruments since the time of the 

 Brussels Conference, as well as the introduction of the aneroid and Bourdon's barometers 



