Sound levels near the north-south road passing by Bamburgh Castle are in the range of 59 to 63 dBA in the daytime (Northumberland Sound Mapping Study, Northumberland, England, June 2003).
Grey noise is random noise subjected to a psychoacoustic equal loudness curve (such as an inverted A-weighting curve) over a given range of frequencies, giving the listener the perception that it is equally loud at all frequencies.
Except in extremely low pressure loads, the exiting propellant gasses generate much higher sound pressure levels (dBa) than any other aspect of the weapon firing.
A treasure containing 3600 Greek coins (bearing the names of Lysimachus, Pharnakes and Asander) weighting 30 kg was looted in August 1998 from the Sarmizegetusa Regia site of Șesu Căprăreței.
There are two modulo 11 algorithms which use different repeated weighting factor patterns: the IBM algorithm which uses (2,3,4,5,6,7), and the NCR algorithm which uses (2,3,4,5,6,7,8,9).
Weighting 0.44 kg empty, it could fire three 7.62 mm rounds, each held in a separate barrel only 2.5 cm long and each having a separate striker.
One reason for this long-winded procedure was to ensure that Watford postal workers received London weighting payments, as Bushey was in the London Metropolitan Police area at the time.