The board of supervisors shall be authorized to make such appropriations for the department of health as may be necessary to pay the salary of the director, and the salaries of all necessary sanitary inspectors, nurses, and such other employees as may be employed for carrying on the work. The board shall be authorized to pay all necessary traveling expenses of said employees in the performance of their duties. The board shall be authorized to pay for all necessary medicine, materials and supplies. The board shall provide an office for its health department, and furnish said office, and its employees, with all necessary record books, stationery, stamps, tables, chairs, furniture and all other necessary articles. The board is also authorized to do any and all things necessary and proper to maintain and support a health department. Where two (2) or more counties shall unite in having a department of health, the amount contributed by each for maintaining and supporting the work shall be agreed upon by the respective counties, subject to the approval of the state board of health, or its executive committee, and all salaries to be paid shall be recommended by the state board of health, or its executive committee to the board of supervisors of the county or counties for which the officers or employees are to act. All employees shall be recommended by the state board of health, or its executive committee, and all salaries shall be recommended in the same way.