464 



NEGRETTI AND ZAMBRA, HOLBORN VIADUCT, B.C. 



2815 



2816 



2817 



2818 

 2819 



2820 

 2821 



FIG. 2427. 



2814 Plained Turned Hard Wood Pushes 



Each. 

 s. d. 



. Is., Is. 6d., 2s. 6d. 036 



FIG. 2396. 



FIG. 2389. 



Porcelain Ornamental Pushes, for indoor use, various, 



each 2s., 2s. 6d., to 5s. and 



Ornamental Brass Pushes, for external use each 5s. 6d., 6s. 



Complete Electric Bell Sets, consisting of Bell, Battery, Wire and 

 Push, ready for fixing. 



2| in. Bell 2 in. Push 1 Leclanche Cell 25 yds. Wire 

 3 3 2 Leclanch^ Cells 30 



H > 3 > 40 ,, 



Indicators, as shown in fig. 2822, for houses or hotels, in polished 



mahogany cases for 6 Nos per No. 12 6 



Switches, Contacts, Fire Alarms, Walnut or Mahogany, one way 

 Switch 2-way 3s., 3-way 4s. 6d., 4-way . . . .6s. 6d. 10 6 



Floor Contacts 2s., Door Triggers 030 



Sash or Door Contacts, for Burglar Alarms, &c. . each 3s. and 046 



6 

 12 



10 



16 



1 1 



DIRECTIONS FOR CONNECTING AND FIXING ELECTRIC BELLS. 



Fig. 1 represents a single " Circuit," in 

 which one Bell, Push and Battery is employed. 



A wire is carried from the Carbon Pole 

 of the Battery to the Push, from the Push 

 to the Bell, and from the Bell direct to the 

 Zinc Pole of Battery. 



Fig. 2 represents manner of enabling the 

 same Bell to be rung from two distinct places. 



The wire from Carbon Pole is carried to 

 each Push by making a junction, as shown 

 in the diagram, and then carried from each 

 Push to the Bell, as shown by the dotted lines. 

 On pressing the Push the Bell will ring. FIG, 2. 



FIG. 1. 



