08-24-1960 Special Meeting - Laserfiche WebLink

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6. Impact noise: A transient noise which does not remain at a particular intensity level for a sufficient time to be accu- rately measured on a sound level meter. 7. Impact noise analyzer: An impact noise analyzer is an instrument used in conjunction with a sound level meter to measure the peak intensity (in decibels) of a tran- sient noise. 8. Ionizing radiation: Gamma rays and x-rays, alpha and beta particles, high speed electrons, neutrons, protons, and other nuclear particles; but not sound or radio waves, or visible, infrared, or ultraviolet light. 9. Octave band: A portion of the audible sound spectrum. Octave band analyzers conveniently divide the audible band spectrum into eight (8) octave bands. 10. Odorous matter: Any solid, liquid, or gaseous matter including but not limited to gases, vapors, dusts, fumes, and mists which cause •an odor sensation to human beings. 11. Octave band analyzer: An instrument used in conjunction with a sound level meter to measure the sound intensity (in decibels) in each of the eight (8) octave bands that make up the significant audible range to which the ear is sensitive. An octave band analyzer that meets applicable requirements of the American Standards Association is suitable for use in determining compliance with this ordinance. 12. Particulare matter: Finely divided solid or liquid matter other than water which is released into the atmosphere. 13. Ringlemann Chart: A chart as described by the U. S. Bureau of Mines Information Circular 6888 and upon which are illustrated graduated shades of gray for use i~n estimating the light obscuration power of smoke. 14. Ringlemann Number: The next lowest shade number on the Ringlemann Chart which most nearly corresponds to the light obscuration power of the smoke being measured. For example, smoke opacity lying between No. 1 and No. 2 shades o~ gray on the Ringlemann Chart will be measured as Ringlemann No. 1 smoke. :~ •