45, COENHILL, E.G., AND 122, EEGENT STREET, W., LONDON. 145 



FIG 174. 



FIG. 177. 



FIG. 181. 



FIG. 180. FIG. 179. 



MARINE BAROMETERS. 



177 Marine Barometer, plain mahogany frame, with Ivory 



scales, sliding vernier, Thermometer, and Brass arm 

 gimbal, for suspension (fig. 177) 



178 Marine Barometer, round, moulded, or carved top, 



with rack- work to vernier, Thermometer, capillary tube 

 to prevent the ingress of air into the column, even 

 during the most violent oscillations of a storm, 

 Brass arm gimbal, &c. ....... 



179 Ditto ditto, in Carved frame (fig. 179) .... 



180 Marine Barometer, best mounted as fig. 180 . 



181 Marine Barometer, best, with SYMPIESOMETER in front ; 



the sympiesometer constructed and laid off with the 

 greatest accuracy by actual experiments, Brass gimbal, 

 &c. (fig. 181) 



182 Board of Trade Standard or Kew Marine Barometer, 



figs. 16 (seepage 11) and 182. 



183 Fitz-Roy's Marine Gun Barometer, fig. 183, (see page 12). 



Each 

 s. d. 



Each. 

 s. d. 



220 2 10 



660 



