TY  - BOOK
TI  - The new universal library: volume twenty-one  
U1  - 031.2 20
PY  - 1969///
CY  - London
PB  - International Learning Systems Corporation Ltd
KW  - encyclopedias  and dictionaries
KW  - library
N1  - CONTENTS

MECHANICS
preliminary ideas
different kinds of motion
force and motion
effects in combination
friction
e.tc

SOUND
what is sound
transverse waves
longitudinal waves
transmission of sound
e.tc

HEAT
sources of heat
thermal expansion and thermometry
e.tc

LIGHT
photometry, shadows, pinhole camera
laws of reflection, mirrors
e.tc

ELECTRICITY AND MAGNETISM
magnetism
electricity
voltage, current and resistance
electro magnetic induction
e.tc

ER  -