Dark ferrous metal, slightly curved, long narrow rectangular shape with vertical rectangular projection about 1/4 inward from a short edge. Curve more pronounced toward one side, similar to a wing leading edge. Projection consists of two thin metal pieces, .8cm tall and 1.2cm wide, soldered to the outwardly curved surface of the rectangle. Lender's catalog number written next to projection.
3 of 3, original 1901, 48.44.3-#19 Franklin Institute catalogue number
Credit Line:
On loan from The Franklin Institute, Philadelphia, PA