▁an ▁elect romagnet ic ▁pul se . ▁War ships ▁built ▁as ▁late ▁as ▁the ▁ 1 9 5 0 s ▁continued ▁to ▁incorpor ate ▁voice pip es ▁alongside ▁more ▁advanced ▁technology . ▁ ▁Mar itime ▁use ▁ ▁Vo ice ▁pip es , ▁the ▁mar itime ▁term , ▁served ▁to ▁transmit ▁reports ▁from ▁look out ▁positions ▁al o ft ▁to ▁the ▁deck ▁and ▁from ▁the ▁bridge ▁to ▁the ▁ste ering ▁position ▁and ▁engine ▁room . ▁These ▁were ▁somewhat ▁larger ▁in ▁diameter ▁than ▁the ▁domestic ▁version ▁and ▁were ▁often ▁covered ▁in ▁sound ▁abs orb ent ▁material ▁to ▁increase ▁their ▁efficiency . ▁ ▁Co pper ▁voice ▁pip es ▁were ▁being ▁fitted ▁to ▁British ▁two ▁and ▁three - deck ▁war ships ▁as ▁early ▁as ▁ 1 8 0 3 . ▁A ▁notable ▁use ▁was ▁on ▁board ▁HMS ▁Vict ory ▁at ▁the ▁Battle ▁of ▁T raf al gar ▁in ▁ 1 8 0 5 . ▁Vict ory ' s ▁ship ' s ▁wheel ▁was ▁shot ▁away ▁early ▁in ▁the ▁battle . ▁A ▁voice ▁t ube ▁was ▁then ▁used ▁to ▁carry ▁ste ering ▁orders ▁from ▁the ▁quarter deck ▁down ▁three ▁de cks , ▁to ▁where ▁a ▁gang ▁of ▁sail ors ▁operated ▁the ▁ship ' s ▁till er ▁directly ▁using ▁ro pes ▁and ▁pul le ys . ▁ ▁One ▁dis adv antage ▁of ▁voice ▁pip es ▁is ▁that ▁they ▁may ▁bre ach ▁the ▁integrity ▁of ▁wat ert ight ▁spaces . ▁This ▁led ▁to ▁the ▁introduction ▁of ▁shut - off ▁val ves ▁on ▁both ▁ends ▁of ▁voice pip es ▁to ▁prevent