MEASUREMENT OF NOISE — KAYE 



185 



Table 1. — Loudness levels of vanous noises — Continued 



ROAD TRANSPORT NOISES 



Source 



Location or distance 



Average 



decibfils 



above 



tliresh- 



old 



Observer 



In street. 

 ....do.... 

 Interior.. 

 In street. 

 Interior. . 

 -—do.... 

 ....do.... 



Britisti: 



Tram on very noisy rails. -., 



Tram, or open-bus top 



Bus, recent type... _ 



Motor car, quiet 



Salon car, average 25 miles per liour. 

 Salon car, average, 35 miles per hour 

 Salon car, quiet, 35 miles per hour.. 



American: 



New York street car (tram) 



Do 



Motor lorry, average 



Motor car, average 



Motor car, quiet 



Horse veliicle, paved street \ do 



Horse vehicle, asphalt street ' do 



Horse, trotting L- ..do 



10-15 feet. 

 Interior.. 

 15-50 feet. 



do-... 



do.... 



Motor horn (British). 



Motor horn (Now York). 



Directed at microphone 



Motor horn (New York), in street- 

 Police whistle (New York) - 



Police whistle --- 



20 feet. 

 23 feet. 



25-100 feet- 



15 feet 



15-75 feet.. 



90 

 70 

 50-60 

 50 

 40 

 60 

 40 



70-75 

 70 

 70 

 65 

 60 

 75 

 60 

 60 

 80 

 70-100 

 3 90 

 70 

 80 

 75 



Davis, N. P. L. 



Do. 

 Kaye, N. P. L. 

 Davis, N. P. L. 



Do. 



Do. 

 Kaye, N. P. L. 



Gait. 



Parkinson. 



Gait. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Davis, N. P. L. 

 Gait. 



Do. 

 Do. 

 Do. 



MISCELLANEOUS NOISES 



General: 



Conversation ..- - 



Whispering 



Applause (New York), Lindbergh. 



Restaurants (London)-.. 



Typists' room 



Church bells -. 



Thunder -.- 



Animals: 



Lion roaring (New York Zoo) 



Siberian tiger roaring 



Bengal tiger snarling 



Dog barking in street 



5 feet 



In crowd- 

 Interior.. 



1,200 feet- 

 1-3 miles- 



18 feet- 

 7 feet_. 

 15 fcet- 

 20 feet. 



VERY LOUD NOISES 



General: 



Riveting 



Do 



Pneumatic drill 



Printing-press room 



Steamship siren 



Do 



Steam pile-driver 



Hammering, building 



Niagara Falls 



Airplanes: 



Airplane engine --. 



Do 



Airplane cabins, varioas. 



Airplane cabin 



3 airplanes in flight. 



35 feet- 

 200 feet. 

 20 feet.. 



115 feet 



1,500 feet 



20-80 feet 



100 feet 



Noisiest spot. 



10 feet... 

 18 feet... 

 Interior- 



do.— 



3,000 feet. 



TRAIN NOISES 



British: 



Express train 



Express train, 60 miles per hour 



Train, windows open 



Train, windows sliut, third class.. 



Train, windows shut, first class 



Train, windows shut, flrst-class sleeper. 



Suburban electric train starting.- 



Tube train (London) - 



Tube train 



12 feet 



In corridor, windows open. 



Interior 



do. 



do 



do 



Interior- 

 do— 



100? 

 70 

 60 

 55 

 50 



45-50 

 70 

 80 



75-80 



Davis, N. P. L. 

 Kaye, N. P. L. 



Do. 

 Davis N. P. L., 



Do. 

 Kaye, N. P. L. 

 Davis, N. P. L. 



Do. 

 Kaye, N. P. L. 



> Average. 



