Promotions and punishment of the officers and servants of the Board (1) Subject to any regulations made under section 19, the power of making promotion to posts in the service of the Board . . . . . shall be exercised by the following authorities, namely: (a) by the Chairman in the case of posts, the maximum monthly salary of which does not exceed three hundred rupees and the servants holding such posts; D (b) by the Board, in the case of posts, the maximum monthly salary of which exceeds three hundred rupees but does not exceed one thousand rupees and officers and servants holding such posts; (c) by the Board, subject to the previous approval of the Government, in the case of posts, the maximum monthly salary of which exceeds one thousand rupees and officers and servants holding such posts: Section 19 of the Act provides that subject to the provisions of the Act, the Board shall with the previous approval of the Government, make regulations with regard to the various matters set out therein such as leave, disciplinary proceedings etc.