Mr. STRACHAN'S for a Method of preparing the Ore of Cobalt
for the various Purposes for which it is applicable in Trade,
Manufacture, and Painting,
Messrs. PATTEN and HANKINSON's for a Discovery and Improve-
ments in the tanning of Leather, by the Use of Pyroligneous
or Wood Acid,
Observations on Mr. BAGNAL'S Patent for a Method of making
Bridle-bits, Snaffles, and Bradoons for Horses, Martingale
Hooks, and Rings of Iron, Steel, or other Metals. Commu-
nicated by the Patentee,
Observations on building the Piers and Abutments of Bridges,
the Walls of Wharfs, &c. without the Expense of Coffer Dams;
and on suspending the Arches of Iron Bridges with Chains from
above while being constructed, instead of supporting them by
centering from below. By Mr. JoHN ISAAC HAWKINS. Com-
municated in a Letter to the Editors,
Observations on Mr. MIER'S Patent for a Method of accele-
rating the Evaporation of fluid or liquid Bodies, &c. Com-
municated by the Patentee,
Observations on Mr. BAKER'S Patent for kneading Dough by
means of Machinery. Communicated by the Patentee,
On Iron Roofing. By T. D. W. DEARNE, Esq. Communicated
in a Letter to the Editors,