It appears from the facts stated that Steele was an engineering apprentice in the Permanent Air Force on full time continuous service. On 7th December 1951 he accidentally sustained an injury to his right arm and wrist which made it necessary that he should retire from the Air Force on the ground of physical incapacity to perform his duties. The incapacity consisted in a marked limitation of the range of movement in his right elbow joint and a substantial loss of the power of pronation in his right wrist. He was discharged from the Air Force on 2nd June 1952. From that time to the present there has been no change in the nature or extent of his physical disability nor in the consequent incapacity it produces for many kinds of civil employment. Upon his retirement on the ground of physical incapacity it became the duty of the board to determine the percentage of his total incapacity in relation to civil employment and to classify him in one or other of three classes according to the percentage determined. Thereupon he would become entitled to a pension according to his classification. The duty is placed upon the board by s. 51 of the Act which prescribes three classes, A, B and C. Class A comprises those incapacitated to the extent of sixty per cent or more, class B those incapacitated to an extent of at least thirty per cent and of less than sixty per cent, class C of those whose percentage of incapacity is less than thirty. The board determined Steele's percentage of incapacity and placed him in class B. The result was that he became entitled, under the provisions of s. 52 (2) (c) of the Act, to a pension amounting to £117 15s. 0d. per annum. Section 53 (1), however, gives the board a power in certain conditions of reclassifying a pensioner. Purporting to act under that provision the board has placed Steele in class C, with the result that under s. 53 (3) his pension has ceased. Steele says that the board's power to reclassify him never arose because the necessary conditions did not exist. Whether they did or did not exist depends upon the meaning of the sub-section, which is in the following terms: - "The Board may, from time to time, if it is satisfied that the percentage of incapacity of a pensioner classified under section fifty-one of this Act has altered, or because of the nature of his employment, should be varied, reclassify him in accordance with the altered percentage of incapacity." It is not suggested on the part of the board that Steele's percentage of incapacity in relation to civil capacity has altered. But it is claimed that under the sub-section the board may alter the classification of a pensioner "because of the nature of his employment", and that it does not matter that there has not been, since the original determination of the board, any actual change in the pensioner's percentage of incapacity in relation to civil employment. It would be enough in any given case if the nature of the employment in which the pensioner had engaged since the first determination indicated that he had not then been properly classified. About the nature of Steele's employment, since the board's original determination in his case, there is no dispute. When he was discharged from the Air Force he obtained employment in the Department of the Postmaster-General as a technician's assistant, a position he held for two months. Before entering the Permanent Air Force he had been a junior postal officer and while a technician's assistant he sought and obtained reappointment as junior postal officer in the Permanent Public Service. The board thereupon purported to reclassify him pursuant to s. 53. Apparently he was first examined by a medical officer. It was then that the board decided that he should be placed in class C, a class covering persons whose incapacity in relation to civilian employment was less than thirty per cent. This meant that s. 53 (3) and s. 52 (3) (c) applied to his case. The date from which his pension ceased as a result of the application of those provisions was 25th June 1953. Steele has since resigned from the public service and obtained other employment but that does not seem material for present purposes.