TELEPHONE - WALL
Magneto Wall Telephones
For use on Magneto call and clear systems
For use in extreme conditions

AB 670, AB 671 & 675
FRAMEWORK, polished walnut, constructed to hold two cells, RK 360 or RK 400 (Old 971 or 586).

MICRO-TELEPHONE. RE 1050 (Old No. 529), with cord RS 6500 (Old No. 2061), resting, on a cradle switch.

GENERATOR. For type and number of magnets see table below.

These generators ring satisfactorily through a line resistance of 25,000 ohms.

RINGER. For resistance see table below.

These telephones have enclosed line terminals and are fitted with a clip for papers.

Dimensions:
Height 27.75 inches
Width 11.75
Depth 9.75
 

Telephones AB 671 and AB 675 are provided with a press button for cutting out the ringer coils and short circuiting the induction coil, the button to be pressed down while ringing.

If specially ordered we supply these two telephones without the press button, but with the connections so arranged that the ringer is cut out when the generator is operated.

Taken from the Ericsson Telephone Catalogue 1912

Additional Pictures

Front at an AB 670.
The key to release the front cover can be seen to the left

Internal view showing a four magnet generator and no press button which shows this is an AB670
The batteries would be placed on the lower shelf - there is no back to the battery area
The generator handle has to be removed to allow the front pull to open

Rear of telephone showing the exposed bell ringer and wiring slots

Generator handle and cover key

Top of the telephone in close up
There are two lightning protectors above the handset and a paper clip on the sloping shelf

Close up of the bell ringer

Left hand side of telephone showing cover key in place and handset plug

Right hand side of telephone showing generator handle
The handle is removed by turning it anti-clockwise

Close up of generator with induction coil and switch hook mechanism located above

Close up of serial number
This telephone was produced in 1903