The Ventilation and Warming of School Buildings (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904. Excerpt: ... r = Iron, tinned 0-08585 Iron, sheet 0-09200 Iron, ordinary 0-56620 Iron, cast, new 0-64800 Iron, sheet and cast, rusted 0-68680 Lead, sheet 0-13286 Glass 0-59480 Chalk 0-67860 Wood sawdust, fine 0-72150 Building stones, plaster, wood, brick.. 0-73580 Sand, fine 0-74000 Calico 0-74610 Woolen stuffs 0-75220 Silk stuffs, oil paint 0-75830 Paper 0-77060 Lampblack 0-81960 Water 1 08530 Oil 1-48000 F. (See page 87.) The Blackmail Fan.--My invention is a ventilatingfan, constructed, as fully described hereinafter, so as to rapidly transmit motion to large volumes of air, carrying the same in solid columns without dispersing it or creating back currents. In the drawings, Pig. A (see page 87, Fig. 13) is a near view of a ventilating-fan with my improvements. Fig. B is a section on the line 1, 2, Fig. A. Figs. C to G (Fig. 32, page 170) are diagrams illustrating the formation of the blades. Fig. H, a perspective view of a blade and the hub. In experimenting with that class of fans used to put air in motion for ventilating and other purposes, I ascertained that, in ordinary constructions, while volumes of air would be driven forward by the revolution of the fans, other volumes would bo thrown off radially, and still others would be thrown backward instead of forward, as desired, creating currents interfering with the free flow of air to the fan. After many experiments I ascertained that by bending each blade outward at the upper end, forming peripheral sections, thus compelling the large volumes ordinarily dissipated in this direction to move directly forward. My present invention relates to certain improvements whereby I have succeeded in preventing altogether any back-flow, insuring a forward propulsion of all the air coming within the influence of the wheel. In ...