MAWSON & SWAN, 



45 



THIEF DETECTORS OR BURGLAR ALARMS. 



This admirable contrivance provides for the disconnection of the 

 circuit by the pressure of the door or window on a small spring. On the 

 removal of the pressure by the opening of the door or window, the circuit 

 is completed and the bell continues ringing. 



Ordinary size 3 6, small size, 2/9 each. 



Larger or smaller sizes can be supplied for Lodge Gates, Bankers' 

 Strong Rooms, Cash Boxes, Tills, &c. 



DOOR TRIGGERS. 



Specially adapted for shop doors, 4 '- each. 



A Set for a Shop Door, comprising trigger, 3 in. bell, 40 yds. wire 

 and two Leclanche' batteries, with screws and staples provided 

 complete, for 30;'- 



FIRE ALARMS, OR ELECTRIC THERMOMETERS, 



8/- and 12,'- (Fig. 115). 



FIG. 115. FIG. 117. FIG. 116. 



FOR LIGHTING GAS BY ELECTRICITY, &c. 



Gas Lighter for Ordinary Gas Burners ; contact made in turning the 

 gas on ; to work with two No. 3 Leclanche' cells, 5/6 (Fig. IT 6). 

 Long Distance Gas Lighting Apparatus, warranted to work up to 

 ^150 yards ; suitable for lighting sun burners, i5/- (Fig. 117). 



13 and 15, Mosley-street, Neivcastle-on-Tyne. 



