MARCONI 
KRYHA 
(3) . Ciphering disc—With the light metal plate K (Exhibit C, 
Figs. 1 & 3) raised, the ciphering disc Fig. 3 is free to be removed. 
To do this place both hands with fingers underneath but not 
under letter ring, and with thumbs on top assert a slight upward 
pressure. 
The letter plates J as on the clear text sector are removable, 
also the metal ring M on which the letters are fixed may be 
removed from the main disc by turning aside the three locking 
springs N. On assembling the metal ring the locking springs 
must be turned into their original position until secured by 
stops P locating in indentions Q. 
Before assembling ciphering disc ascertain that all letter 
plates are fully inserted. Then place the socket of the disc over 
the pivot R, turn slightly to left or to right until locating pin 
slips easily into the pivot groove. 
Under no circumstances should force be used. 
(4) . Ciphering wheel—Having removed the ciphering disc, 
the ciphering wheel Fig. 2 is free to be taken out. 
The ciphering wheel is fixed to a permanent disc by means 
of a milled nut S, also is held under spring pressure by a lever T 
the dowl pin W of which locates in the small holes, i.e., stop 
points. BEFORE LIFTING UP THIS LEVER BE ASSURED 
THAT THE MOTOR LOCKING KEY IS PUSHED HOME. 
It will be observed that the small hole U is used as a register 
for the locating pin V fitted on the permanent disc. When 
replacing ciphering wheel, first place register hole over pin, 
tighten nut, and carefully depress lever, also taking care that 
the teeth of the driving wheel Y must come between two 
groups of teeth on the ciphering wheel. 
Releasing Motor— Dismantle (having locked the motor) 
the ciphering disc and wheel, and withdraw with care the 
locking device, releasing of the mechanism being retarded from 
time to time by careful manipulation of the locking key. 
TWELVE