The Art of Horse-Shoeing: A Manual for Farriers

by William Hunting

Fig. 56.—A good bearing-surface.

In [Fig. 56] we have a model bearing-surface on the foot, nearly twice the width of the wall, and we have a shoe with a flat foot-surface capable of using the whole bearing. Such is the fitting of all hind shoes, and it might well be adopted with advantage in all fore shoes on good feet.

Clips are thin projections drawn up from the outer border of shoes for the purpose of giving greater security to their position on a foot. On heavy cart horses the clips are sometimes of great size and encourage the idea that the smith looks upon them as designed to assist the nails to retain the shoe on the foot. They should have no such purpose, their use being merely to prevent the shoe shifting to one side. A clip should not be narrow and high, it should be low and wide so that its bearing is taken against the lower edge of the wall. A high clip is a most serious danger when shoes get loose and are trodden on by the horse. The usual position for a clip is at the toe, but there are occasions when two clips—one at each side of the toe—are used. On some shoes a clip is placed at the outer quarter to prevent the shoe being displaced inwards; this is more often required on hind shoes. A clip at the toe affords some assistance in fitting a shoe exactly, and it also affords steadiness to the shoe during the driving of the first nails. In America clips are not used, and when American machine-made shoes were first introduced into London they were fitted without clips. I am bound to confess that these shoes did not shift on the feet to any noticeable extent, but they are now all fitted with clips so I suppose the workmen found they were an advantage. The greatest evil resulting from clips is seen in slovenly fitting, when the farrier with his knife carves out a great hole in the wall in which to imbed the clip. As a clip is flat it cannot be fitted to the rounded face of the wall, but all that is necessary is to reduce the round to a flat surface with the rasp, so that the clip may rest on it, care being taken that at the extreme edge the horn is not left so prominent as to be unduly pressed upon when the clip is driven close to the wall. It is easy to lame a horse by violently hammering up the clip, especially when the horn behind it has been so much cut away as to leave only a thin protecting layer. A clip should only be hammered up sufficiently to leave it firmly applied to the wall. A bad workman in making his clip may spoil the foot-surface of a shoe by causing a bridge on the bearing surface of the iron at the toe, and this, on thin or flat feet, may cause lameness.

A very unsightly appearance and very defective work results from the fireman leaving his clip at right angles to the line of the shoe. It should be inclined backwards at about the same slope as the portion of wall against which it is to rest. The two diagrams ([Fig. 57]) illustrate what is meant.

Fig. 57.—Toe Clips.

Hot and Cold Fitting. When an engineer or a carpenter has two surfaces to fit together with great exactness he employs some colouring material to show where they do come in contact and where they do not. When a farrier fits a shoe to a horse's foot he tests its adaptation by applying it at a dull red heat to the horn. This proceeding shows with precision the bearing surfaces, as the horn is charred in proportion to the contact. If the shoe be found not to fit exactly, it is taken back to the anvil and altered. It is then again for a few seconds applied to the horn and the surface of contact examined. This proceeding is repeated until sufficient exactness is arrived at and then the shoe is cooled ready for nailing on. As horn is a bad conductor of heat this process of "hot-fitting" does no harm to the sensitive structures within the hoof unless it be carried to an extreme. When the horn is very thin the heat of a shoe retained too long in contact with it does serious mischief, and the injury known as a burnt sole has often resulted from careless work. If a shoe, whilst being altered to fit a foot, were cooled each time it was laid on the hoof, it would have to be re-heated before the necessary alterations could be made and this would cause great waste of time. The abuse of hot-fitting may do harm without any direct burning of the sole. An ill-fitting hot shoe may be held on the hoof until it beds itself into the horn and thus a complete correspondence between the surface of the foot and the surface of the shoe be effected. Such a proceeding is well described as "fitting the foot to the shoe" and is not only destructive to the horn but damaging to the foot by permitting an uneven shoe to look as though it were properly fitting. When hot-fitting is used and not abused—when it is adopted merely to indicate how and where the shoe fits, and not to make it appear to fit—I consider it has many advantages over cold-fitting. With some feet and some shoes it is quite possible to produce a good fit without heating the shoe. When a shoe requires much alteration to bring it into exact correspondence with the foot, even the most expert farrier cannot do justice to his work with cold iron—he gets as near to a fit as he can and when the hoof is strong little harm is done. The best work is that which includes the greatest exactness of fit, and uneven pressure or loose shoes result from inferior work. A badly fitted shoe requires more nails to retain it in place, and experience has shown that hot-fitted shoes give a smaller average of loose or lost shoes than those cold-fitted. The slight charring of the end of the horn fibres which results from proper hot-fitting has never been found to do injury, and it apparently has some advantages. One is that the surface of the hoof less readily absorbs moisture than when not charred. Another is that the horn is softened for a time and expanded, allowing nails to be easily driven, and then contracting and retaining them more firmly. The objection to hot-fitting applies only to its abuse. The advantages are greater exactness of fit, greater security that the shoe will be firmly retained on the foot, and greater facility in the operation of shoeing. Perhaps I ought to add that when cold-fitting is inevitable machine-made shoes are the best, because they are more regular in form, and more often level on the foot-surface than hand-made shoes. Army studs on active service, and studs used in coal mines comprise, perhaps, the only animals upon which cold-fitting is unavoidable.