Section 1. Definitions. “Pistol” or “revolver” as used in this Act, means any firearm with barrel less than twelve inches in length. “Crime of Violence”, as used in this Act means any of the following crimes, namely, murder, manslaughter, rape, mayhem, assault to do great bodily harm, robbery, larceny, burglary and house-breaking. Section 2. Committing crime when armed. If any person, when armed with a pistol or revolver, shall commit or attempt to commit an act constituting a crime of violence, he may in addition to the punishment otherwise provided for the crime, be punished by imprisonment for not more than one year or by a fine of not more than one thousand dollars ($1,000.00) or by both; provided, that the act aforesaid be one which is capable of being committed or facilitated by means of a pistol or revolver. Section 3. Being armed prima facie evidence of intent. In the trial of a person for committing or attempting to commit a crime of violence, the fact that he was armed with a pistol or revolver and had no license to carry the same, shall be prima facie evidence of his intention to commit said crime of violence; provided, that the criminal act committed or attempted be one which is capable of being committed or facilitated by means of a pistol or revolver.