 Wooden boxed magneto bell
with two external gongs used with C.B. table telephones..Complete with
capacitor, 1000 ohm ringer and two winding induction coil.
Generally used with Telephones No. 2, No.
10 and No. 150 etc (Candlestick telephones).
The housing is called a Case No. 1 and could be constructed of American
Walnut, Black Chuglam, Pyinma, Halou, Tasmanian Myrtle or African Mahogany.
Bellset No. 1 with Bias Spring, was also available for Telephones
No.
76, No. 82 and No. 124.
This variant used a "Bell No. 1A, unmounted, with
Bias Spring" as the ringing mechanism. Probably marked "BS" on the
rear of the case.
Click here for more information on Bias Springs.
Do not confuse with a Bell No. 1A which is a
smaller case and only
comprises of a bell ringer and two gongs.
By 1946 this Bellset was superseded by Bellset No. 25.
Bellset No. 1 Mark 235
Identifying a Bellset No. 1
| |
Mark |
| Includes |
Blank |
234/5 |
NT10 |
NT12 |
NT19 |
| Bells No. 1, unmounted |
1 |
1 |
- |
- |
- |
| Bells No. 11, unmounted |
- |
- |
1 |
1 |
- |
| Bells NT No. 1002A |
- |
- |
- |
- |
1 |
| Coils Induction No. 3 or 14 |
- |
- |
1 |
1 |
1 |
| Coils Induction No. 4 or 14 |
1 |
1 |
- |
- |
- |
| Condensers MC No. 2 or 30 |
1 |
- |
- |
1 |
1 |
| Condensers MC No. 3 or 30 |
- |
1 |
- |
- |
- |
| Condensers MC No. 6 |
- |
- |
1 |
- |
- |
| Bell Gong No. 2 |
- |
- |
2 |
2 |
- |
| Bell Gong No. 3 (Aluminium) |
- |
- |
2 |
2 |
- |
The above was taken from the GPO Rate Book (1928)
Wiring Diagrams - N501 (1919) and
N501 (1929).
Drawing - 1751.
Adjustment of Magneto bells
Click here for the difference between a Bell and a
Bellset
Pictures showing Bellset No. 1 with the capacitor (bottom of left hand
picture)
and the Coil Induction No. 4 (above the capacitor)
Bellset No. 1 Mark 234. The capacitor is mounted on the Bellset
door.
The wiring capacitor is connected to the main body through the hinges.
The Bell ringer is fitted with a bias spring.
Made by Siemens Brothers their Number Q2217
Picture of Bellset No. 1 Mark 235 with Coil Induction No. 18
This Bellset has most probably been factory refurbished by the GPO as the
Induction coil is of the
later type and the terminals are on the base,
instead of on the bottom of the front casing.
Note the second paster diagram, pasted over the original paster
Early Bellset No. 1
These Bellsets below are early examples, they can be GPO or NTL
examples.
The capacitor in both styles, fits inside the base.
 |
 |
| Front View |
Internal View |
 |
| Front view showing diagram and latch |
| |
 |
| Close up of terminals |
Bellset No. 1 with door lock
 |
| Front view of the case and to the left is the
capacitor which has been removed from the base. |
| |
 |
| View of the base showing where the capacitor
fitted. The lower fixing clip is missing. |
| |
 |
| Inside the Bellset showing Induction coil and
bell ringer |
Bellset No. 1 with door lock
Ericsson (1909)
An unusual layout
The terminals are mounted on a projection
Unusually marked inside the casing - E 09 (Ericsson made in 1909)
|
