19. (1) Where there is a contract for the sale of specific or ascertained goods the property in them is transferred to the buyer at such time as the parties to the contract intend it to be transferred.(2) For the purpose of ascertaining the intention of the parties regard shall be had to the terms of the contract, the conduct of the parties and the circumstances of the case.(3) Unless a different intention appears, the rules contained in section 20 to 24 are rules for ascertaining the intention of the parties as to the time at which the property in the goods is to pass to the buyer.