2005.068.019
Transparency, Lantern-slide
Glass Lantern-Slide. Bears a chart of "Boiler Room Data" showing showing average rating, ratio of banking hours to steaming hours and b.t.u. per pound of coal as weighed for 1929-30. On the back is a white sticker with the number "21" handwritten on it. The edge of the slide is covered in black tape.
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