314 
ARTILLERY IN COAST DEFENCE. 
such attack laid down. Instructions, based on these schemes of 
defence, would be issued to Section Commanders and Fort Com¬ 
manders to guide their action. 
All information as regards the organisation and the schemes of 
defence are kept in record books. 
In every fort there is such a book kept up to date, and giving full 
details on all the points which have been mentioned, besides others, 
such as barrack and camping accommodation for the garrison, water 
supply, facilities for landing men for reliefs, &c., position of mine-fields, 
with ranges and trainings from the guns told off for their defence, 
positions for movable armament with ranges to landing places, &c., 
position and ranges to datum points for position-finder and depression 
range-finder instruments. Also details of the armament and spare 
stores, capacity and contents of magazines, &c. Also the object of the 
work in the scheme of defence and its relation to other works, and the 
action to be taken when attacked. 
Accompanying the record book would be a detailed plan of the fort 
showing the grouping of guns, allotment of lifts, &c., to the groups 
and position of all fighting stations, &c. A chart of the sea area 
copied from the Admiralty chart would give on it all information with 
reference to height and set of tides, depth of water channels, position 
of five and three-fathom lines, and should have marked on it the arcs of 
fire of the guns and their extreme ranges, also any directions in which 
it would be dangerous to fire for fear of damage to friendly works. 
There should be marked ranges to datum points from position-finder 
and depression range-finder stations, and ranges from guns to con¬ 
spicuous objects to centre of channels and to five fathom line in given 
directions; also limits of range of electric lights (this is not much 
more than 2000 yards under favourable conditions, rapidly diminishing 
with the presence of mist or smoke). 
There would be also a map of the land covered by the fire of the 
fort, if any, with similar information on it, to enable fire to be opened 
as speedily as possible at known distances. In the Fort Commander's 
station must also be provided lists of foreign ships arranged under 
“ types," with description and directions how to employ the guns of 
the fort to greatest advantage against each type (Vide “ Fire Tactics "), 
and tables for correcting range and deflection when depression range¬ 
finder is used (Vide “ Fire Control.") 
Similar books and charts are provided at the Section Commander's 
station dealing with the whole section, and containing instructions for 
fighting the section against squadrons of different strength and com¬ 
position ; also lists of foreign vessels, giving descriptions by which 
they may be recognised, and showing roughly what each fort would 
be capable of doing if ordered to attack them. 
(To be Continued.) 
