When the maker or holder of a negotiable instrument signs the same, otherwise than as such maker, for the purpose of negotiation, on the back or face thereof or on a slip of paper annexed thereto, or so signs for the same purpose a stamped paper intended to be completed as a negotiable instrument, he is said to indorse the same, and is called the "indorser."

[See, section 15, the Negotiable Instruments Act, 1881 (Act No. XXVI of 1881)].