Single bonds.

Notwithstanding any other provision of law, the board in any proceedings authorizing securities hereunder: A. may provide for the initial issuance of one or more securities (in this Section 61 called "bond") aggregating the amount of the entire issue, or a designated portion thereof; B. may make such provisions for installment payments of the principal amount of any such bond as it may consider desirable; C. may provide for the making of any such bond payable to bearer or otherwise, registrable as to principal or as to both principal and interest, and where interest accruing thereon is not represented by interest coupons, for the endorsing of payments of interest on such bonds; D. may further make provision in any such proceedings for the manner and circumstances in and under which any such bond may in the future, at the request of the holder thereof, be converted into securities of smaller denominations, which securities of smaller denominations may in turn be either coupon bonds or bonds registrable as to principal, or principal and interest, or both.