. The practical telephone handbook and guide to the telephonic exchange . Sectional Elevation at JCy. Fig. 155.—Full size can then be adjusted comparatively close to the cores, butmust be prevented by non-magnetic core-pins from actuallytouching when attracted. The Western Electric two-coil drop is constructed xf /»_ P. Fig. 156 on this principle, and has been very extensively used. is a sectional side view, showing only one coil of thehorseshoe electro-magnet; Fig. 156 is a plan; and Fig. 157 SWITCH-BOARD APPARATUS HS a front elevation of two shutters, d is the drop shutterpivote
. The practical telephone handbook and guide to the telephonic exchange . Sectional Elevation at JCy. Fig. 155.—Full size can then be adjusted comparatively close to the cores, butmust be prevented by non-magnetic core-pins from actuallytouching when attracted. The Western Electric two-coil drop is constructed xf /»_ P. Fig. 156 on this principle, and has been very extensively used. is a sectional side view, showing only one coil of thehorseshoe electro-magnet; Fig. 156 is a plan; and Fig. 157 SWITCH-BOARD APPARATUS HS a front elevation of two shutters, d is the drop shutterpivoted at the bottom ; c a lever attached at right anglesto the armature, very near to the cores k of the magnet cores at the other end are attached by iron screws tothe strip of iron F (shown in section), which forms the yokeand support for some five or ten drops. In order to lessenfriction, conical bearings are used for the armature pivots. The ends of the magnet coils are soldered to the tabs shownat an angle on the right of Fig. 156, these forming the terminalconnections. Night-Bell Contact.—Along the bottom of the front of eachstrip of drops is stretched a copper wire (shown in section in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
