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- 33 - TOP SECRET-T
S.S.S (Single Self Steckered) Menus. Single Self steckered menus are
those in which the correct stop is expected to have at least one self
couple. Some of the bombes have been equipped with a special SSS socket
installed on the diagonal board, the contacts of which connect
consecutively to the self steckered points on the diagonal board. These
bombes may then be plugged in such a way that they will stop only if there
is one or more self steckers on the menu, The bombes so equipped are
indicated on the IC OPS board. There are two methods of plugging
this type menu;
Method I. (For all ordinary menus having 3 or more links on the input).
The menu is plugged normally except: -
(a) the input is connected to a separate common other than the normal
input common,
(b) the special SSS jack is connected to the same common,
(c) an EEL plug is inserted in the same common with all the letters
off the menu plus the input letter plugged(short circuited.)
(d) searching is done at any letter off the menu.
(e) the relays that fall will indicate those letters which are self
coupled.
@ (f) these are the letters from which checking will have to be started
Fig. 28. Circuit of SSS(Single Self Steckered) Jack.
Method II. (For weak menus)
The menu is plugged normally except: -
(a) the SSS jack is connected to the set of commons below the normal
input common.
(b) insert an EEL plug in the top jack of these commons with all
letters off the menu connected together with a "daisy chain" leaving
the unused plugs hanging.
Hand-written note at @: plugging arranged so that current from input reaches
spider via SSS jack and all letters off menu are excluded by daisy chain
plugging and same daisy chain is used to supply current to the search point
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