Section 18. There shall be two chief general court officers for each branch, each with the title of assistant sergeant-at-arms, and such assistant chief general court officers, general court officers and pages as shall be established by the committees on rules of the two branches of the general court acting concurrently. Such employees shall receive such compensation as may be established by the said committees acting concurrently. There shall be a maintenance superintendent for each branch and such assistants as may be necessary, for whose fitness and good conduct the sergeant-at-arms shall be responsible, and such employees shall receive such compensation as may be established by the said committees acting concurrently.