Information of the general working of W/T apparatus [coherers] [1],  [jiggers - part of a tuning circuit transformer - see page 104 below in the 1903.two pdf  file to see the primary and secondary of a jigger feeding a coherer direct from an aerial input: jigger's are used with all spark equipments including transmitters], [cowtails - the ends of the aerial cable either at the aerial or in the office, [accumulators - collecting and storing electricity: batteries].

New Service sets - 63 sets have been issued of the Marconi Type

Appropriation of W/T apparatus November 1902 [two pages separated by 'insulators'.

Insulators for Wire Aerials

Alterations & Improvement "A new type of Coil" - Spark Gap coil.

Information on Shore Stations.

Notice in this file that HMS Collingwood is a Coastguard Ship.  Also that HMS Hood was fitted with W/T kit from Marconi and not the RN kit [HMS Vernon].  Of significance, the Hood was sunk in one of the entrances to Portland Harbour to stop Germans U-Boats and E-Boats from gaining entry.

W/T Instruments under Trial.
Magnetic decoder - better than a coherer ?
Popoff -  Ducretet apparatus - not a success
Motor transformer - trying to improve the spark gap transmitter
High resistance shunt for coherer - not approved !
W/T Kites - go fly your kite and succeed !
Wire aerials - is the system cracking up ?
Accumulators - a break through with batteries
Potentiometers - coherer improvements again
Lodge-Muirhead System of W/T - an improvement on the coherer and the navy is interested in knowing more!
Progress in Syntonic Telegraphy - Captain Jackson's system