Solid core disk

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“The metal cut away near the center reduces the weight and provides passages for air circulation.” — Hawkins, 1917

Source

Hawkins and Staff Hawkins Electrical Guide Number One (New York: Theo. Audel and Company, 1917) 326

Downloads

TIFF (full resolution)

2400×2380, 549.4 KiB

Large GIF

1024×1015, 56.0 KiB

Medium GIF

640×634, 31.3 KiB

Small GIF

320×317, 13.8 KiB