The accompanying figures indicate certain of the methods recommended for use in the State House ventilation.

Figure 1 shows the desk arrangement proposed for the admission of air to the representatives' chamber.

Figure 2 shows the method advised for the discharge of air from that chamber into the attic, each gallery having its own vent through its ceiling and close to its rear wall into the same attic.

Figure 3 shows the designed and board vent from the attic, through the cupola stairway and cupola ceiling and dome, vent by open cupola door or window being considered unreliable because of varying wind action.

Figure 4 shows the pattern of roof ventilator proposed for the attic of the extension. It is designed to allow free egress of air and to prevent the entrance of rain and snow

They open freely

Figure 5 shows the arrangement of check valve recommended for all but fireplace flues for the prevention of down draught through them, and to allow the escape of air when the supply to a room exceeds the discharge capacity of its fireplace. Such valves should be made of the lightest gossamer rubber cloth. for the egress of air, and close lightly against its movement in the reverse direction. In the absence of such check valves reversal is liable to occur, first, when the supply is shut off from a room and the ingress of air to supply that removed by the fireplace must be by inward leakage; second, when the attic air and that in the flues connected with it becomes so chilled and heavy as to overcome the tendencies, otherwise favorable, to the flow in the desired direction; third, when by the discharge of air into the attic through other channels than the flues is so free and the vent through the roof is so restricted as to produce a partial plenum condition within the attic s pace.