For single riveting up to 1-in. plates the diameter of the rivet may equal one and one-fifth times the square rent of the thickness of the plate, the rivet hole being one'-twelfth larger. The pitch may equal 1*09 in. plus the diameter of the rivet hole. For a 3/4-in. plate the rivet by this rule would be l1/16 in. in diameter and the pitch about 2 3/8 in.