Show thin iron in the international exhibition of hol 1801 a specimen of iron paper was shown this led to some competition among fron masters a as to the thinnest thinness to which cold iron iran could be rolled one maker produced a sheet of paper so no thin that 1600 layers of it piled upon one another measured only one inch tn in thickness the fineness of the iron foil referred to may be understood when it is remembered that 1200 she sheets eta of the thinnest tissue paper arranged tn in the same manner measure a traction more than one inch in thickness the iron paper was perfectly smooth and easy to write upon but when held up to the light it was porous we are not aware of any practical use to which iron paper could be put for owing to its liability to rust it would be tar far interior inferior to the paper that we are accustomed to |