45, CORNHILL, E.G., AND 122, BEGENT STEEET, W., LONDON. 



321 





FIG. 1384. 



1384 

 1385 



Prismatic Azimuth Compass, with Card Dial & Sights 

 Best do. do. with divided Metal I 



arranged for Iron Ships (fig. 1385) 



1385* Tripod Stands for above 



1386 Prismatic Azimuth Compass, with double Needles, Copper ring, inside 



bowl (Sxow HARRIS'S arrangement), best mounted in mahogany box, 



specially suited for Iron ships, with extra Box for Card and Iron feeders to 



preserve the magnetism .800 



BITCHIE'S PATENT LIQUID COMPASS. 



FIG. 1387*. 



1387 The principle on which the RITCHIE'S LIQUID COMPASS is constructed, is the 

 enclosing of the magnetic needles in metallic cylinders, and connecting with the 

 needles and the card a closed air-chamber, by the buoyancy of which, in the liquid 

 the bowl is filled with, the weight resting upon the pivot is reduced to less 

 than a single gramme, preventing all friction and wear at the point of the pivot. 

 The resistance of the liquid gives to the card far greater steadiness than can be 



Cabin and Transparent Compasses are measured ly the bowl. 



