(telegraphy) straight key

(telegraphy) straight key

(telegraphy) key

to use / to employ / to make use of, to apply / to spend

message / statement / speech

to transmit

transmission

length / height

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend