OF MAGNETIC INSTKUMENTS. 



175 



FIG. 2018. 



FIG. 2014. 



FIG. 2017- 



FIG. 2044. 



FIG. 2016. 



FIG. 2035. 



Compound Horse-shoe Magnet, of several single horse-shoe magnets held together 

 by screws, and having a proper armature greatly increases the magnetic 

 power, not only for suspending weights but also in capability of making 

 other magnets (fig. 2044) : 



Long. 



2039. 3 inch. 



2040. 6 inch. 



2042. 9 inch. 



2043. 12 inch. 



2044. 4 inch. 



2045. 8 inch. 



2046. 10 inch. 



2047. 12 inch. 



With intermediate and proportionate prices according to size and number of bars, as 

 10-inch, with 12 bars, 3 3s. ; 14-inch, ditto, 5 5s. ; up to 30-inch, with 12 bars, 15. 



2058. BAB MAGNETS, in pairs, from 12 to 24 inches long, very powerful and permanent, 

 as used for adjusting iron vessels, per Ib. . . 012 



THE WEIGHTS vary slightly, but the average weight of a pair 24 inch, long, of usual 

 width and thickness, viz., 1^ inch, by inch is about 51bs. 3oz. 



DITTO, DITTO, 18 inch, long, 1| inch, by % inch is about 41bs. 

 DITTO, DITTO, 12 inch. 1 inch by | inch is about If Ibs. 



