(c) By the Use of a Bar Shoe.—Where the frog is not excessively wasted benefit will be derived from the use of a bar shoe.
FIG. 68.—BAR SHOE.
The transverse portion at the back, termed the 'bar,' and which gives the shoe its name, is instrumental in bringing about from below that counter-pressure on the frog that we now know to be so necessary a factor in remedying contraction. When the frog, by wasting or disease, is so deficient as to be unable to reach the 'bar,' this shoe must be supplemented by a leather or rubber sole.
In the event of corn or sand-crack existing with the contraction, the shoe known as a 'three-quarter bar' is preferable (see Fig. 103). The break here made in the contour of the shoe allows of dressing the corn, and, in the case of sand-crack, removes the bearing from that portion of the wall. (d) By the Use of a Bar Pad and a Heelless or 'Half' Shoe.—The bar pad consists of a shape of rubber composition firmly fixed to a leather foundation, which shape of rubber takes the place of the 'bar' of the bar shoe.
FIG. 69.—RUBBER BAR PAD ON LEATHER.