File:Charles Spalding Diving Bell, The Saturday Magazine, Vol. 14, 1839.png

Summary
https://books.google.com/books?id=caFGAQAAIAAJ&pg=PA200&lpg=PA200&dq=spalding+diving+bell&source=bl&ots=4yQab1TiCW&sig=6DFEveAVZe_DJBEekEFnvlBJngU&hl=en&sa=X&ei=QrT9UPTYHo79qAHfxYDABQ&ved=0CE0Q6AEwBQ
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