Improvements in or relating to Chimney Tops or Ventilators.

Реферат: 7170. Naue, A. March 24. Chimney and ventilating-shaft tops.-The top, shown in section in Fig. 2, comprises a vertical shaft 1, to which is secured a top cross-tube 3 surrounded at each end by a tubular casing 5 of larger diameter. A flap 6 is mounted on a horizontal rod 8 arranged centrally above the vertical shaft and within the cross-tube, the rod being connected to a large windplate 7 by means of side - cranks 9 engaged in slots on levers 14 pivoted to plates 12 on the vertical shaft. As the wind blows in the directions indicated by the arrows, it moves the wind-plate and flap into the positions shown in full or dotted lines respectively.