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A. The flue of the Nile steamer if reduced to the cylindrical form would be 35-1/2 inches in diameter to have the same area; but it would then require to be made

**47-3**/4 feet long, to have the same amount of heating surface, excluding the bottom as non-effective.
Indeed the artistry of most of the verses discussed is, as any reader will notice, more on the plane of the later work than of the Ciris, written about

**47-3**B.C. It is safe to say that Vergil did not in his youth write the sonorous lines of Aen. I, 285-290, just as they now stand.
The flue of the Nile would require to be 35- 1/2 inches in diameter if made of the cylindrical form, and

**47-3**/4 feet long; the tubes of a locomotive if 1-3/8ths inch diameter would only require to be 22.19 inches long with the same velocity of draught; but as the draught is 11.11 times faster than in a flue boiler, the tubes ought to be 246.558 inches, or about 20-1/2 feet long according to this proportion.