§ 122. Compensation of official referees. Every official referee continued in office and serving under the provisions of this article shall receive as compensation one-half of the amount now or hereafter paid to the incumbent of the office which he held prior to his retirement; provided, however, that any official referee of the municipal court of the city of New York in the first or second judicial department so continued in office shall receive as compensation three-fourths of the amount paid to the incumbent of the office which he held prior to his retirement. Any official referee of the city court of the city of New York who is serving as such on April tenth, nineteen hundred forty-six, shall be entitled to receive as compensation, two-thirds of the amount paid to the incumbent of the office which he held prior to his retirement. Any official referee of the supreme court heretofore or hereafter appointed who shall be assigned for service as such official referee in any county outside of the county wherein he resides, and any official referee of the court of appeals who shall be assigned for service as such official referee in any county outside of the county wherein he resides, shall receive in addition to the compensation provided for by this chapter, his actual traveling expenses from his residence to the place in such county where he has been assigned for services as such official referee and, if such place is less than twenty-five miles from his residence, the sum of ten dollars per diem and if such place where he has been so assigned is more than twenty-five miles from his residence the sum of twenty dollars per diem and he shall receive such additional moneys during the time that he is actually engaged in rendering services as an official referee in such county. The manner of payment of such compensation and its sources are to be the same as in the case of the incumbent of the office from which such official referee has retired.