It should be fixed in the head by means of a thin, barbed iron wedge.
For trimming specimens, smaller hammers may be employed (Sketch 6): The form of the head, recommended for this purpose by Dr.MacCulloch,* is rectangular.

The dimensions of the face may be 1 inch by 3/4; the height 2 1/4.
(*Footnote.

On the forms of Mineralogical Hammers, Quarterly Journal Royal Institution volume 11 1821 page 1 etc.) It will be expedient to have always some hammers, of different sizes, in reserve.
A small miner's pick is useful for cutting out, and splitting portions of slaty rocks; or for obtaining specimens of clays, etc.
A small stone-cutter's chisel.

A chisel with a handle, of the form here represented, will often save the hand of an inexpert collector, and better enable him to direct his blow.
For packing the specimens.

A stock of strong paper.