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PREFACE
CONTENTS.
EXTRACT FROM PREFACE TO THIRD EDITION
CHAPTER I.
OPTICAL MEMORANDA: SIGHT EXERCISES AT MUSKETRY INSTRUCTION :
DESCRIPTION OF LENSES, &c.
PAGE
vii
ix
ON THE VARIOUS CONDITIONS OF SIGHT WHICH RESULT FROM DIFFERENCES
IN REFRACTIVE POWER AND FOCAL ADJUSTMENT OF THE EYE.
ON THE POWER OF SIGHT REQUIRED for RECRUITS, WITH A DESCRIPTION
OF THE TEST-DOTS EMPLOYED FOR TESTING IT.
Regulations on visual examination 178
176
Nephelopia.
. 177
Test-dots
180
Principles on which they were
formed
. 179
Counting test-dots