In and for the purposes of this Act

61 . — The author of any new and original design shall be considered the proprietor thereof, unless he executed the work on behalf of another person for a good or valuable considération, in which case such person shall be considered the proprietor, and every person acquiring for a good or valuable considération a new and original design, or the right to apply the same to any such article or substance as aforesaid, either exclusively of any other person or otherwise, and also every person on whom the property in such design or such right to the application thereof shall de volve, shall be considered the proprietor of the design in the respect in which the same may hâve been so acquired, and to that extent, but not otherwise.