MAWSON & SWAN, 



FIG. 1 1 8. 



Apparatus to show action upon a rectangular current movable round 

 an axis perpendicular to an indefinite current, i5/- and ~~' 

 (Fig. 1 1 8). 



FIG. 119. FIG. 120. 



Apparatus to illustrate the Electro Dynamic and Electric Magnetic 

 rotation of liquids, with movable stage and Bertin's Commutator, 

 6o/- (Fig. 119). 



VOLTAMETERS THE ELECTROLYSIS OF WATER. 



Apparatus for the decomposition of water by Galvanism, small size, 

 having two graduated glass tubes, 3/- and 3/6 



Do., larger size, supported over circular glass trough, on stand, 

 8/- and io/- 



Do., superior make, and larger, for lecture table (Fig. 120), iS/6, 



2 1/- and 25/- 



13 and 15, Mosley-street, Newcas tie-on- Tyne. 



