In counties of the fourth, fifth, sixth, seventh and eighth classes, the township assessor and the assistant township assessor in each township of the first class shall receive, as compensation for his services, ten ($10.00) dollars per diem for each day actually employed by him in the performance of the duties of his office, both in making the triennial assessment and in making the supplemental assessments in the intervening years between the years of the triennial assessment; the said compensation to be paid by the county as heretofore. The compensation of the assistant triennial assessors in the said townships of the first class shall be five ($5.00) dollars per diem for each day actually employed by them, respectively, in the performance of the duties of their office, to be paid by the county as heretofore. In addition to the compensation hereinbefore provided, the township assessors, assistant township assessors, and assistant triennial assessors of first-class townships shall be reimbursed by the county for any expenditures made for postage or stationery necessarily used in the performance of their duties and for any necessary office rent.