139. Use of chattel lent.

The borrower must use the chattel only for the particular purpose for which it was lent to him, and if he uses it for any materially different purpose he becomes liable as an insurer1.

Generally speaking, the permission accorded by the owner of a chattel to a borrower to use it is purely personal, and cannot, except by the owner's express consent, be extended to a third party2. The reason for this limitation is that the chattel is lent by the owner to a person with whose capacity and honesty he is presumably familiar. Therefore, should the borrower license a