An exact table to bring Old Tenor into lawful money : also a table to know the value of pistoles, guineas, johannes, and double johannes, moydores, English crowns, half crowns, shillings, and copper half-pence, at the rate of dollars at six shillings a piece, at which invariable value they are fixed by a late act of this government : the act to be in force from and after the 31st of March 1750.