that is to say, the lights reflected in the mirror must show clearly
when viewed through the rectangular aperture on the left of the
lantern. The Examiner must always satisfy himself that these conditions
are fulfilled before commencing the examination.

13. Darkness Adaptation.—It is essential that a candidate should be
    kept in a room which is either completely or partially darkened for at
    least a quarter of an hour before he is required to undergo this test.

Before the examination commences the Examiner must satisfy
himself that the room in which it is conducted is so darkened as to
exclude all daylight.

14. Method of Testing.—The lantern supplied for the examination
    is so constructed as to allow one large or two small lights to be visible,
    and is fitted with twelve glasses of three colours—red, white, and
    green. At the commencement of the examination the Examiner
    should show to the candidate a series of lights through the large
    aperture, and should require him to name the colours as they appear
    to him. Care should be taken in showing the white light to
    emphasize the fact that the light is not a pure white.

If a candidate makes a mistake of calling the light “‘ red,”’ a proper
red light should be shown immediately after, and the candidate’s
attention directed to the difference between the two.

After a series of lights through the large aperture has been shown,
the Examiner should make a complete circuit with the two small
apertures, requiring the candidate to name the colours of each set
of two lights from left to right. To prevent any possibility of the
order in which the lights are arranged from being learnt, the
Examiner must at least twice in each circuit go back a varying
number of colours.

A record of any mistakes made with either the large aperture or
the two smaller apertures should be kept on Form Exn. 17c, in
accordance with the instructions thereon.

15. Passing or Failure.—If a candidate with either the large
    aperture or the two smaller apertures of the lantern mistakes red
    for green or green for red he should be considered to have “‘ failed ”
    in the lantern test.

If the only mistake made by the candidate with the lantern is to
call the white light “‘red,”’ and if, after his attention has been
specially directed to the difference between the two, he makes no
further mistake of this nature he should be considered to have
passed in the lantern test.

If a candidate makes any other mistake with the lantern—i.e.,
if he calls white “‘red”’ repeatedly or red “‘white”’ at all, or confuses
green and white—his case should be reported to the Principal
Examiner, and he should be told that the decision as to whether he
is passed or failed, or a further examination is necessary, will be communicated
to him in due course. Pending receipt of the Principal
Examiner’s instructions such a candidate should only be allowed
to proceed with the remainder of the examination for a certificate
of competency on the express understanding that the latter examination
will be cancelled in the event of failure in the sight tests.

16. Further Examination and Appeals.—If in the cases covered
    by the preceding paragraph the Principal Examiner decides that a
    further examination is necessary, arrangements will be made for a
    special examination to be held, and the second-class travelling-
    expenses necessarily incurred by a candidate in attending such an
    examination will be paid by the Marine Department, together with a
    subsistence allowance at a rate which will be notified to the candidate,
    but which will not in any circumstances exceed 10s. for each
    day necessarily occupied in attending the examination. In these
    cases the above expenses will be paid whatever may be the result
    of the final examination.

If, however, on the report of the local Examiner the Principal
Examiner decides that the nature of the mistakes made shows conclusively
that a candidate’s sight is so defective as to render him
unfit to hold a certificate, the candidate shall be considered to have
failed.

In cases where, upon the report of the local Examiner, a candidate
is failed by the Principal Examiner, as well as in the cases covered
by subpara. 15, the Marine Department will be prepared to allow a
candidate who is dissatisfied with this decision to appeal for a special
examination; but the Marine Department will not pay the travelling-
expenses of any such candidate unless he is reported by the Special
Examiners conducting the appeal examination to have passed.