(a) The City Treasurer shall be the disbursing officer of the City. All bills legally contracted by any officer or Board of said City and approved by a majority of the Board of Finance, shall be paid by warrant directed to said Treasurer and drawn to the person to whom the City is indebted, except as herein otherwise provided. Such warrant shall show upon its face the indebtedness for which it is drawn and shall refer to the appropriation by the authority of which such indebtedness was incurred.

(b) All vouchers for such warrants shall be kept on file in the office of the City Clerk. No money shall be paid out of the City Treasury except upon warrant signed by the Mayor for bills approved by the Board of Finance, such approval to be authenticated by the City Clerk, except that when any bills against the City have been approved by the Board of Finance, and the Mayor neglects or refuses for 10 days to sign the warrant, the same may be signed by a majority of the Board of Finance. But this provision shall not apply to expenditures of the school commissioners and orders drawn by courts in exercise of their criminal jurisdiction.

(c) A full record of expenditure shall be kept by the Treasurer, which shall show at all times the amount of every warrant paid under the authority of each appropriation of the Board of Aldermen.