“Single-tier” “Single-tier” Superposed. (short) (full-length) Type No. 2 Length (feet). 4.27 5.30 4.27 Area of two pair of wings (sq. feet). 44.8 54.0 87.6 Weight of two pair of wings (pounds). 5.04 5.5 10.36 Weight of aerodrome with two pair of wings (lbs.). 27.04 27.5 32.36 Total weight to be supported (lbs. per sq. ft.). 0.603 0.51 0.369 Drift of wings (lbs.). 6.06 6.13 6.9 Assumed drift of aerodrome body (lbs.). 1.0 1.0 1.0 Total drift (pounds). 7.06 7.13 7.9 Soaring speed (ft. per sec.). 27.0 24.7 25.3 Thrust horse-power expended. 0.35 0.32 0.364 Brake horse-power expended. 0.70 0.64 0.73 The first line shows the calculations for the aerodrome when equipped with the short “single-tier” wings; the second line, when equipped with the “single-tier” wings of the full length used in the flights of 1896; and the third line, when equipped with superposed wings, Type No. 2. It will be seen that, on the whole, the result of the comparison of the full-length “single-tier” wing and the superposed one is less in favor of the latter than was to be expected, as, aside from its greater structural strength, it seems to have no real point of superiority, except that it is shorter; and, as already pointed out, one point of presumable inferiority, though not exhibited in the table, is the fact that the rear set of wings would suffer relatively more from being in the lee of the front ones, in the case of the superposed wings, than in the case of the “single-tier” ones.