[4] As part of the London Electrical Engineers, Territorial Force, Tucker was granted a commission, being promoted from lance corporal to temporary second lieutenant, General List in April 1916.
[6] In 1917, sound-ranging was further developed so that allowances could be made for poor weather conditions, as sudden gusts of wind could cool the wire: the most effective method found was to wrap the devices in several layers of camouflage netting.
[8] Tucker developed a system of moveable microphones to improve detection techniques, allowing for a high degree of accuracy in determining the position of the enemy guns.
The technique could also be extended to listen out for enemy aircraft; as a result, Tucker became Director of Acoustical Research, Air Defence Experimental Establishment, Biggin Hill.
Some of these sound mirrors still survive along England's south coast, such as those to be found at Denge, near Dungeness, to the west side of a lake slightly north of Lydd-on-Sea, and others uncovered in 2014 at Fan Bay near Dover.
This location system provided a choice between two signal outputs at the Command Post, one for feeding the then currently in-service recorders, the other for the provision of anticipated processors of wider sonic frequency-range.
The electronic output-filter in this system was designed to follow a frequency response similar to that of Tucker's Helmholtz Resonator, the details of which are identified in his impressive paper.