Promissory notes are legal contracts that outline the terms of a loan and enforce the promise that a borrower will repay a loan within a specified period. A Promissory Note is a legal agreement between the Borrower and Lender that lays out the specific terms of the loan.To secure the payment of such balance the defendant, at the time of the delivery of the notes, also delivered to plaintiff a chattel mortgage on said machine. This is a Model Subordinate Mortgage Form.