Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers . M. Levet 23. ISOO. Pl«. 7. 48 THE CENTRIFUGAL FAN structed inlet, one of the claims of the Davidson patent, is one of thefeatures of this fan. According to the patent, the blades of this fanare twice as long as their radial dimension while the Davidson patentspecifies blades as being at least three times as long. The spacingof the blades is here equal to the depth of the blade, while the David-son fan uses about 2/3 of the depth. That is, the Davidson patentcalls for longer blades more close
Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers . M. Levet 23. ISOO. Pl«. 7. 48 THE CENTRIFUGAL FAN structed inlet, one of the claims of the Davidson patent, is one of thefeatures of this fan. According to the patent, the blades of this fanare twice as long as their radial dimension while the Davidson patentspecifies blades as being at least three times as long. The spacingof the blades is here equal to the depth of the blade, while the David-son fan uses about 2/3 of the depth. That is, the Davidson patentcalls for longer blades more closely spaced, and with an intakechamber relatively greater in diameter than the fan here shown. Fig. 7 shows sectional views of the fan patented by M. Levelin April, 1890. This is in some respects similar to the one justshown although no claim is made in the patent covering the propor-tions used. One noticeable feature about this fan is the generoususe of guide vanes, both in the inlet and outlet of the fan. Theseconstitute one of the principal claims of the patent. The bladesas here sho
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