The moneys in the fund shall be kept separate and apart from any other fund, by the treasurer of the municipality, and the moneys in the special fund may be invested by the corporate authorities of the municipality in obligations issued by the United States of America and general obligation bonds of the Commonwealth of Pennsylvania or any political subdivision thereof. All income derived from any investment of the said fund shall be paid into the special fund. The corporate authorities may sell any such securities and reinvest the moneys in other securities, or convert such securities into cash when the same may be needed for expenditure under the provisions of this act.
53 P.S. § 2293