Whenever and as often as a majority of the electors voting at an election heretofore held or hereafter called and held, in any city of the second or third class, shall vote in favor of the issuance of bonds of such city for the purpose of purchasing, extending and improving, or purchasing, constructing or extending works, for the purpose of supplying such city and its inhabitants with natural gas, water, electric light, or heating, or street-railway or telephone service, it shall be lawful for the governing body of said city, by ordinance duly passed, to direct the issuance of the bonds so voted, which said bonds shall be issued according to law.
K.S.A. 12-834