Each board member, with the exception of the mine inspector members, shall receive thirty dollars ($30) a day for each day actually employed, not exceeding ten days in all during the year, together with traveling expenses at the prevailing State rate for each mile necessarily traveled in going from his home to the place of meeting and return, by the shortest practicable route.

Each member shall also be reimbursed for all other necessary expenses incurred in the discharge of his duties. Each board of examiners is hereby authorized to employ the services of a clerk, whose compensation and rate of mileage shall be the same as that of members of the board. The clerk of each board shall, on final adjournment, send to the secretary properly attested vouchers for compensation and expenses of each member of the board, and also a voucher covering his own compensation and expenses, which vouchers shall be approved by the chairman of the board. The secretary shall then approve said vouchers and transmit them to the Auditor General who shall issue warrants on the State Treasurer for their payment.