Which of the following principles are key to relative dating
Sods of earth for camouflaging the positions have been removed in the rear from beneath trees and brush (9). The forward perimeter and flanks are protected by a double-apron barbed wire fence (a 'Flanders fence', 8) some 30-50m from the positions, keeping the troops beyond hand-grenade range. An inset (J) shows the interior of the observation post for the battery, complete with a depression position finder, spotting binoculars and transmitting dial This battery, located on Primrose Hill in North London, was one of only three twin-5.25in. These guns were diverted from Navy contracts and were obtained in an exchange for Bofors LAA guns. The beach is also protected by a pillbox (I), and also by several Spigot Mortar positions close to the guns. Anti-tank cubes form the next level of protection (D), with concertina barbed wire laid behind them.
An inset (I) shows the layout of a 1941 -pattern HAA command post, different to the CP in the main illustration: key features include a Lewis gun (i), heightfinder (ii), predictor (iii), plotting room (iv) and emergency exits (v). Considerable thought was given to the camouflage of coast artillery positions. The Wanstone battery was eventually dismantled in 1957This illustration shows the layout of a typical 'Emergency Battery' position and defended beachhead in 1942. coast defence guns (No.1 Gun is at A, and No.2 Gun is at B), which cover the approaches to the beach. On this type of terrain the positions were typically at 10m intervals, less in densely wooded terrain. Time permitting, some scattered rifle and one or two light machine-gun positions may have been dug in the rear and oriented in that direction (3).