SEC. 51: Each county or township officer, Board or Commission shall appoint, from the eligible civil service list, for either permanent or temporary service, all assistants, librarians, deputies, clerks, attachés and other persons in the office or department of such officer, Board or Commission, as the number thereof is fixed and from time to time changed by the Board of Supervisors; provided, that appointments to the unclassified service in their respective offices and departments shall be made by such officers, Boards and Commissions, without reference to such eligible list. SEC. 52: The compensation of any elective county or township officer shall not be increased nor diminished during the term for which he was elected, nor within ninety days preceding his election. No compensation for any position, nor of any person under civil service, shall be increased or diminished without the consent of the Civil Service Commission specifically given thereto in writing. SEC. 53: Whenever any person in the service of the county is compelled to travel in the performance of his duty, he shall, in addition to his regular compensation, be reimbursed for his actual necessary expenditures for transportation, the hire of conveyances, and for lodging and meals. An itemized account of such expenditures shall be filed with the Clerk of the Board of Supervisors and be approved by the Auditor before being paid. The Board of Supervisors shall fix a maximum price to be paid for such lodging and meals, which shall be uniform and be made applicable to all persons alike, including members of the Board of Supervisors. SEC. 54: No attorney, agent, stockholder or employee of any firm, association or corporation doing business under or by virtue of any franchise granted by, or contract made with the county, shall, nor shall any person doing such business, nor shall any person financially interested in any such franchise or contract, be eligible to or hold any appointive county office. SEC. 55: The District Attorney, Public Defender, County Counsel, and their deputies, shall not engage in any private law practice, and they shall devote all their time and attention during business hours to the duties of their respective offices. SEC. 56: Nothing in this Charter is intended to affect, or shall be construed as affecting, the tenure of office of any of the elective officers of the county or of any district, township or division thereof, in office at the time this Charter goes into effect, and such officers shall continue to hold their respective offices until the expiration of the term for which they shall have been elected unless sooner removed in the manner provided by law; nor shall anything in this Charter be construed as changing or affecting the compensation of any such officer during the term for which he shall have been elected. But the successors of each and all of such officers shall be elected or appointed as in this Charter provided, and not otherwise.