Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1265
Switch Boards 1231 Fig. 557 shows the same panel when capacity is larger.The panel at left is for 1,000 and 1,200 K. W., the nextfor 1,500 K. W. and over. The cuts on right side show theback and side view of the 1,500 K. W. panel.
