. Electric railway journal . Fan Chamber at Lagrange Street areas in the sidewalk on account of the large number ofpeople passing in the daytime. As an example of the operation of the ventilating sys-tem, the section having the fan chamber near the OldSouth Meeting House, at Milk Street, may be enters at the entrances at Summer Street. FranklinStreet, the Old South Meeting House, Water Street andthe Old State House, at State Street, as shown by thearrows, to the arch duct C. .The foul air entering the ductat C flows to the fan chamber near the Old South MeetingHouse, which is a
. Electric railway journal . Fan Chamber at Lagrange Street areas in the sidewalk on account of the large number ofpeople passing in the daytime. As an example of the operation of the ventilating sys-tem, the section having the fan chamber near the OldSouth Meeting House, at Milk Street, may be enters at the entrances at Summer Street. FranklinStreet, the Old South Meeting House, Water Street andthe Old State House, at State Street, as shown by thearrows, to the arch duct C. .The foul air entering the ductat C flows to the fan chamber near the Old South MeetingHouse, which is a distance of about 270 ft., and is theredischarged into the atmosphere by means of the motor-driven electric fan. At La Grange Street, Haymarket yVA SMINC TON SURFACE :>••>•: 1 : ■ —1 ELEVAT/ON. 1 Openings Into Air Duct from Tunnel at Eliot Street Place and the Old South Meeting House the exits for foulair on what was formerly private ground. At AdamsSquare, however, the discharge is through a grated open-ing on the easterly side of the Adams monument. The fans used for ventilating the Washington StreetTunnel are of the Sturtevant multivane type, driven di-rect-connected by Sturtevant eight-pole motors. Thesefans consist of a wheel made up of 60 blades securelyriveted to the side plates and to the steel arms, the otherextremity of which is cast in the hub. The blades are During the month of March I was invited by some ofyour members to address a few words to the committeesof the Iowa State Legislature on the subject of brakes, andmore particularly on the comparison of the modern handbrake with the air brake for service onmedium-weight city cars. After thesehearings your Mr. Crafts addressed aletter asking me to prepare a paper em-bodying as much of the argument usedbefore the
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