MANTON, Circuit Judge.
The appellant sues for infringement of claims 4, 6, 7, and 9 of the Bell patent, No. 1,141,520, granted June 1, 1915, and claims 1, 2, 4, and 6 of the reissue patent to Pratt, No. 15,210, granted October 18, 1921, which read as follows:
Bell Patent, No. 1,141,520.
"4. In a steam boiler, the combination, with longitudinally disposed upper and lower banks of tubes, of a transverse pass for the products of combustion having an...
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