Improvements in Frost Cogs and Frost Nails.

摘要

13,171. Watkins, B. June 4. Nails. - Chisel-ended frost cogs and nails are provided with blunt lateral projections 2 adapted to receive the blow of a hammer. These may be formed on one or both sides, and at either or both ends or, in the case of a nail, between the ends of the chisel part 1. The head may rise directly from the taper neck of the nail, or by means of a shoulder 6.