There shall be a legislative library to be located in the state capitol in rooms assigned by the commissioner of general services, conveniently accessible to the members of both houses of legislature, and such library shall be open throughout the year. Such library shall be suitably furnished, equipped and maintained under the direction of the legislative librarian, within the amount of any moneys available therefor by appropriation, subject to joint rules, if any, that may be adopted by the senate and assembly in relation thereto. There shall be, for such library, a legislative librarian and such assistant librarians and other employees as may be provided for in the legislative appropriation bill. Such librarian, assistant librarians and other employees shall be chosen by the temporary president of the senate and speaker of the assembly. One of the assistant librarians shall be assigned by the legislative librarian to have charge of the legislative correspondents’ room in the capitol. The legislative librarian and assistant librarians heretofore chosen by the president of the senate and speaker of the assembly, and in office when this section as hereby amended takes effect, shall continue to serve until their successors shall be chosen. The salaries and compensation of the legislative librarian, assistant librarians and other employees shall be payable from moneys appropriated in the legislative appropriation bill. During a vacancy in the office of legislative librarian, the assistant librarian who shall have been longest in the service of the state as a legislative employee, shall be employed as acting legislative librarian with the powers and duties of such librarian, and shall receive during such period the compensation herein prescribed for the legislative librarian. Such librarian shall have charge of the legislative library, but the two houses of the legislature may, by joint rules, regulate the use of the library and prescribe the powers and duties of the legislative librarian and the assistant librarians. The legislative librarian, the assistant librarians and employees of the legislative library shall be considered to be employees of the legislature for all purposes.