This figure had been arrived at by an original requirement for a battery mounting fifteen 68-pounder guns on a tier with 15 feet between each gun.
Eli nani kwafikelwa kulo ngesidingo sokuncanyathiselwa sebhethri sokuncamathisela imipu yephawunda 68 eyi15 kwithala eliziinyawo eziyi15 phakathi kompu ngamnye.