Ellsworth M. Longfield, Sheet metal drafting — Chapter IX: Frustums of Rectangular Pyramids (1921)
“ Only one corner of Fig. 191 is treated for rivet holes, but it is required that the rivet holes for all corners be located. The 5⁄8-inch edge for covering the 1⁄4-inch rod may now be added to complete the pattern. The Bail—The bail is shown in Figs. 189 and 190 by dotted lines. Since the bail is below the top line of the pan, it must be drawn carefully in order to scale the dimensions accurately. It is generally placed so that the bail ear will be to the rear of the center. The ear is attached in such a manner that the "stop" will maintain the bail in an upright position. ”
