his invention or discovery he shall apply therefor in writing to the
Minister of Interior, and shall file in the office of the Interior
Department a written description of the same and of the manner and
process of making, compounding and using it, in clear, concise and exact
terms and in case of a machine he shall explain the principle thereof
and of the manner in which he has applied that principle so as to
distinguish it from other inventions, and he shall particularly point
out and distinctly claim the part, improvement or combination which he
claims as his invention or discovery. When the nature of the case admits
of drawings the applicant shall furnish them as set forth in Section 2.
When the invention or discovery is of a composition of matter, the
applicant shall furnish a specimen of ingredients and of the
composition, sufficient in quantity for the purpose of experiment. In
all cases which admit of representation by model, the applicant shall,
if required, furnish a model of convenient size to exhibit
advantageously the several parts of his invention.