OF

ACOUSTICS, LIGHT,

AND

HEAT.

BY

J. C. BUCKMASTIE

Of the Science and Art Jepartment. and Kaminerin hamistry and
Physics to the Ruyatullage ofceptors,

REVISED. CORRECTED. AT . #

CHARLES LES

Princibal of the Trade chnot orthametan

jaturni

OF

ACOUSTICS, LIGHT,

AND

НЕАТ.

BY

J. C. BUCKMASTER,

Of the Science and Art Department, and Examiner in Chemistry and
Physics to the Royal College of Preceptors.

REVISED, CORRECTED, AND ENLARGED BY
CHARLES LEES,

Principal of the Trade School, Northampton; Lecturer on Chemistry and
Natural Science at Clevedon College, Northampton, and at the
Northampton Museum Science Classes.

LONGMANS AND CO.; SIMPKIN, MARSHALL, AND CO.
DUBLIN: SULLIVAN BROTHERS, 27, MARLBOROUGH STREET.
MANCHESTER: JOHN HEYWOOD. AND ALL BOOKSELLERS.

LONDON

J. AND W. RIDER, PRINTERS,

BARTHOLOMEW CLOSE.

SYLLABUS

ISSUED BY THE SCIENCE AND ART DEPARTMENT.

ACOUSTICS,

LIGHT, AND HEA T.

FIRST STAGE, OR ELEMENTARY COURSE.

Questions will be confined to the following subjects :-
Acoustics.

The pupil ought to have a perfectly clear notion of the manner in which a wave is propagated.

He ought to know what is meant by the terms density and elasticity as applied to air and other bodies, and how heat and cold affect the density and elasticity of air.

He ought to be able to describe simple experiments to prove that air possesses both weight and elasticity. He ought to understand the law of Mariotte, the construction and use of the air-pump, and what occurs when a sounding body is placed in a space from which the air has been withdrawn.

He ought to be taught to see the play of elasticity in the propagation of a sonorous wave through air, and to have a clear mental image of the condensation and rarefaction which make up such a wave. He must, of course, be able to distinguish between the motion of a wave and the motion of the particles which at any moment form the wave.

He ought to know how the velocity of a wave is affected by a change of density, by a change of elasticity, or by a change of both.

He ought to know the velocity of sound in air of the freezing temperature, and also the amount of augmentation of velocity for every degree of the thermometer. The temperature of the air being given, he ought to be able to calculate the velocity of sound through it; and the velocity of sound being given, he ought to be able to calculate the temperature of the air.

No doubt or confusion must rest within his mind regarding the meaning of the terms velocity, intensity, and amplitude. He ought also to know the relation of the last two to each other.

He ought to know the laws of the reflection of sound by tubes and mirrors, and to be able to apply his knowledge to the explanation of echoes.

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