HUTTON.

The velocity of sound does not very much vary, whether it goes with

the wind or against it. As sound moves vastly swifter than the wind,

the acceleration it can thereby receive can be but inconsiderable;

and the chief effect we can perceive from the wind is, that the sound

will be carried to a greater distance by it. Sound will be louder

in proportion to the condensation of the air. Water is one of the

greatest conductors of sound: it can be heard nearly twice as far as on

land.

The bombardier, and pocket gunner · 第 44 / 47 题