The Accepted Rule for Determining the Angle of a Jack

question 4

Multiple Choice

The accepted rule for determining the angle of a jack arch states that "the skewback angle should be _____ of span of the opening for each 4" of arch depth."

• A) ¾' per yard
• B) ½' per yard
• C) ¾" per foot
• D) ½" per foot

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