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Have your hores standing squarely on level ground Feel for the back edge of the scapula |
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Place a chalk mark indicating
the back of the scapula and up to the spine. This will be for
crossection "A" position Place another chalk mark across the spine at the lowest part of the spine just behind the withers. This will be for crossection "B" position. This position is approximately at the 13th/14th Thoracic vertebrae. Place the last chalk mark 8 inches (20 cm) to the rear of the "B" mark. This is position "C" |
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To
measure 8 inches (20cm) use any one of the rock patterns
"R". They have 8 inches marked on them from the "B" position back
to "C" |
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At
position "A" (over the withers), use the "A"section cards as shown to
find the one which fits the closest. The smallest/narrowest sizes start at S4 and get larger/wider up to S7 and from there D4 to D8 This photo shows that for this horse, D4 is too narrow. |
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This
horse measures closest to D5. Double-check by testing with the next size up (wider) and one size down (narraower). |
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D6 is too wide. Record the best fitting size on the record sheet. For this horse: at section "A" (withers) D5 |
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Repeat
the process at position "B" with the cards labeled "B" Record the measurement on the record sheet. |
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And
repeat again at "C" position |
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The cards will have a mark on the
profiles to indicate the relative position for the "Rock" paterns. Transfer this location to the horse using a piece of chalk. |
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To measure the "rock", test with each
of the "R" cards to find the one which fits closest. Line up the card parrallel to the spine passing through the chalk marks that you just made on the horse. In the middle of each "R" card is reference point to line up with the "B" position cross-sections. |
| The "R" cards should be held at
right-angles to the horse's musles at the "B" position. This
means that it will be a little more verticle than right-angles to the
shoulder and a "stick out to the side" more than verticle to the loin
muscles. |
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Choose the "R" card size which fits
closest. There are 3 sizes R6, R9 & R12. R6 being the flattest to R12 with the most "rock" Record the size on the record sheet !! |
