Paragraph 1 F1

if he has completed fifteen but less than twenty-one years service, an annual sum equal to one fiftieth of his annual pay for every completed year of service; and

if he has completed twenty-one but less than twenty-five years service, an annual sum equal to twenty fiftieths of his annual pay with an addition of two fiftieths of his annual pay for every completed year of service about twenty years; and

if he has completed twenty-five years service an annual sum equal to thirty fiftieths of his annual pay with an addition of one fiftieth of his annual pay for every completed year of service above twenty-five years, so, however, that the pension shall not exceed two thirds of his annual pay.