cabezal is head, now...
continuo, not sure it could be translated as continuos head!!!
try this...
Fig 3 Type 1A Recorder Data Channel Locations for Two- and Four-Channel Recorders 9 .... lished by a continuous head current with the ...
ieeexplore.ieee.org/iel1/4523/12818/00590567.pdf?arnumber=590567