Definitions
from The Century Dictionary.
- Of or pertaining to equality of sound: as, an isacoustic line or surface.
- noun A line or curve, upon a diagram of acoustic intensities, drawn everywhere through points of equal intensity of sound.
Etymologies
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Examples
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Towards the north-east, the coincidence is not so close, but this is chiefly owing to the magnitude of the northern counties, which causes a deflection of the isacoustic lines towards the north.
A Study of Recent Earthquakes Charles Davison 1899
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A number of points at which the percentage is 50 is thus obtained, and the curve drawn through them is the required isacoustic line.
A Study of Recent Earthquakes Charles Davison 1899
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The isacoustic lines are also elongated in the direction of this band.
A Study of Recent Earthquakes Charles Davison 1899
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The percentage varies in different counties, from 93 in Inverness-shire to 77 in the counties of Perth and Aberdeen; but the records in the more distant regions are too few to allow of the construction of isacoustic lines.
A Study of Recent Earthquakes Charles Davison 1899
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The references to passing waggons, etc., are so numerous that it is possible to draw curves, in the same way as isacoustic lines, which represent equal percentages of comparison to this type out of the total number of comparisons.
A Study of Recent Earthquakes Charles Davison 1899
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The isacoustic lines thus show how the audibility of the sound varies throughout the sound area.
A Study of Recent Earthquakes Charles Davison 1899
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The peculiar form of the isacoustic lines will be evident at a glance.
A Study of Recent Earthquakes Charles Davison 1899
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_ -- The dotted lines in Fig. 60 represent isacoustic lines -- that is, lines which pass through all places where the percentage of observers who recorded their perception of the sound is the same.
A Study of Recent Earthquakes Charles Davison 1899
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There is therefore no marked distortion of the isoseismal lines when crossing the hyperbolic band, while the isacoustic lines are completely diverted from their normal course.
A Study of Recent Earthquakes Charles Davison 1899
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Thus, the study of the isacoustic lines strongly confirms the conclusions at which we have arrived above (p. 223) -- namely, that there were two distinct foci arranged in a north-west and south-east line, and that the impulse at the former focus occurred a few seconds earlier than that at the latter. [
A Study of Recent Earthquakes Charles Davison 1899
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