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Circumference Measurements

Four circumference measurements (C1, C2, C3, and C4) are taken from each main beam with a 1/4-inch steel ring-end circumference measuring tape. 
Illustration
FIRST CIRCUMFERENCE MEASUREMENT

The first circumference measurement (C1) is taken at the smallest point between the burr and first point or brow tine (P1).

SECOND CIRCUMFERENCE MEASUREMENT
The second circumference measurement (C2) is taken around the main beam at the smallest point between the first point (P1) and the second point (P2).

THIRD CIRCUMFERENCE MEASUREMENT
The third circumference measurement (C3) is taken around the main beam at the smallest point between the second point (P2) and third point (P3).

FOURTH CIRCUMFERENCE MEASUREMENT
The fourth circumference measurement (C4) is taken around the main beam at the smallest point between the third point (P3) and the fourth point (P4).

MISSING FIRST POINT CIRCUMFERENCE RULE
If no first point (P1) exists, take the smallest circumference measurement between the burr and the second point (P2) and credit that circumference measurement to both C1 and C2 on the score sheet.

ILLEGAL OR BROKEN FIRST POINT CIRCUMFERENCE RULE
If the first point (P1) exists but is too small to be a legal point, or if it has been broken off, leaving the obvious swollen area where the point once existed, circumference measurements C1 and C2 will be taken in their normal places, as if a legal P1 was present.

4-Point SideCIRCUMFERENCE POINT OF MEASUREMENT RULE FOR RACKS WITH FOUR TYPICAL POINTS OR LESS PER SIDE

FOUR-POINT SIDE

At the point where the centerline of the last typical point intersects with its baseline, scribe a line across the main beam at right angles (90 degrees). Measure from the center point of this line, over the center of the outside curve of the main beam to the tip of the main beam. Divide this measurement in half and take the fourth circumference measurement around the main beam at the halfway point.



3-Point SideTHREE-POINT SIDE

At the point where the centerline of the last typical point intersects with its baseline, scribe a line across the main beam at right angles (90 degrees). Measure from the center point of this line over the center of the outside curve of the main beam to the tip of the main beam. Divide the distance into thirds and take the third circumference measurement at one-third the distance to the tip of the main beam and the fourth circumference measurement at two-thirds the distance to the tip of the main beam.

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BTR Scorer's Handbook