724 THE HONG KONG GOVERNMENT GAZETTE, DECEMBER 24, 1930.
8. Tests to be varied.-The Examiner should take care, by vary- ing the order of the test sheets and by every other means in his power, to guard against the possibility of any deception on the part of the candidate.
II. LANTERN TEST.
9. Apparatus.--A special lantern and a mirror have been pro- vided for this test. The lantern should be placed directly in front of the mirror, so that the front part of the lantern is exactly ten feet from the mirror. Care should be taken that the lantern is pro- perly placed, that is to say, the lights reflected in the mirror must show clearly when viewed from the position of the candidate on the left of the lantern. The Examiner should always satisfy himself that these conditions are fulfilled before commencing the examination.
10. 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.
11. 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 12 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 emphasise the fact that this light is not a pure white. If a candidate makes a mistake of calling this light "red," a proper red light should be shown immediate- ly 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 should 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 Exu. 17b in accordance with the instructions thereon. In all such cases the mis- fakes nude by a candidate in the letter fest should also be recorded on the form.
12 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 lanten 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.c., if he calls white "red" repeatedly or red "white" at all, or confuses green and white, his case should be submitted to the Principal Examiner Masters and Mates 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 the receipt of the Principal Examiner's instructions such a candidate should only be allowed to proceed with the remainder of the examina- tion 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.
13. 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. (See rule 26).
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