Sec. 154-18. Each department shall adopt and keep an official seal, which shall have engraved thereon the coat of arms of the state as described in section thirty of the General. Code, shall be one and three-fourths inches in diameter, and shall be surrounded by the proper name of the department, to which may be added the title of any division, board or commission within the department, if the director of the department shall so prescribe. Such seal may be affixed to any writs and authentications of copies of records and official papers, and to such other instruments as may be authorized by law or prescribed by the proper authority in any department to be executed. When so authenticated, any copy of such record, official paper, or other instrument shall be received in evidence in any court in lieu of the original. Each department shall provide for the keeping, within such department, of such records and journals as may be necessary to exhibit its official actions and proceedings. Sec. 154-19. Each department is empowered to employ, subject to the civil service laws in force at the time the employment is made, the necessary employes, and, if the rate of compensation is not otherwise fixed by law, to fix their compensation. Nothing in this chapter shall be construed to amend, modify or repeal the civil service laws of the state, except as herein expressly provided. All offices created by sections 154-5 and 154-6 of the General Code shall be in the unclassified civil service of the state. Sec. 154-20. All employes in the several departments shall render not less than eight hours, of labor each day, Saturday afternoons, Sundays and days declared by law to be holidays excepted in cases in which, in the judgment of the director, the public service will not thereby be impaired. Each employe in the several departments shall be entitled during each calendar year to fourteen days leave of absence with full pay. In special and meritorious cases where to limit the annual leave to fourteen days in any one calendar year would work peculiar hardship, it may, in the discretion of the of the department, be extended. No employe in the several departments, employed at a fixed compensation, shall be paid for any extra services, unless expressly authorized by law. Sec. 154-21. Under the direction of the governor, the directors of departments shall devise a practical and working basis for cooperation and coordination of work and for the elimination of duplication and overlapping functions. They shall, so far as practicable, cooperate with each other in the employment of services and the use of quarters and equipment. The director of any department may empower or require an employe of another department, subject to the consent of the superior officer of the employe, to perform any duty which he might require of his own subordinates.