Captain Jackson's navy system sends signals over 5800 yards [3¼ miles] whilst Marconi achieves 21120 yards [12 miles] between two ships.

Speed of Morse code is 10wpm, automatically recorded - no operator with pencil or earphones.

Defiance and Scourge fits.

Under induction coil, note the quaint expression 'rain-tight'.

Connecting to Coil.  Although not stated, Captain Jackson  had a big advantage over Marconi, when he [the latter] was developing equipment on terra firma namely the sea and the wonderful natural earth it provided, whereas a good earth ashore was [and is] a real problem for engineers.

In the receiver section, he explains the early coherer. Plates 27 and 28 are not marked on the pdf file but they are obvious as to which is which.

Once set up, the tapper and receiver parts needed no further attention. In the Shunts section, today, we would call this a 'permanent mark'.

Notice the advantages and the disadvantages, especially the first advantage when it states "In the event of the apparatus giving satisfactory results at sea", and later in the fifth advantage, the cables used between the Port Authority to communicate with ships in harbour.  The lead into the disadvantages is all telling with a goodly amount of woe...."a bar to its [W/T] ever superseding the existing method [V/S].