Motor insulated on a parallel timber base.
Terrell Croft Library of Practical Electricity (New York, New York: McGraw-Hill, 1920)
TIFF (full resolution)
3000×1611, 768.9 KiB
Large GIF
1024×549, 76.0 KiB
Medium GIF
640×343, 38.6 KiB
Small GIF
320×171, 13.3 KiB