Design for a small Green-house or Conservatory. 665 



tank (f) is 12 ft. by 10, and 6^ ft. deep, arched over, and covered 

 with a movable flag-stone at the mouth, supplying the pump 

 (g), through the bottom of whose trough the waste water is 

 again returned into the tank, m is a glass door opening into 

 a library, and n a similar door opening into the drawing-room. 

 Fig. 124. is a section of the main beam, 44 ft. long, extend- 



124 



1^ 



ing through the centre of the building, and upon which the 

 inner ribs and lights rest. The gutters, lined with lead (h), are 

 cut out of the solid beam, and fall each way to the three hollow 

 cast-iron pillars (c c c) standing over the centre drain. 



Fig. 125. is a cross section of the roof, where III I are the 



rafters, on which the lights rest, 

 exactly after the same manner 

 as those of the common cucum- 

 ber frame, with the addition of 

 a slip of wood, 5 in. wide, ex- 

 tending from the ridge to the 

 gutters along the rafters, to cover the outer wood- work of the 

 lights, after they are returned to their places in September. 

 Without this the rain water would find admission down the 

 openings at the sides of the lights. This is essential to the 

 dryness of the house ; and if the two or three screws, with 

 which they are fixed, are well greased, they are readily taken 

 off from such lights as are removed for the summer. The 

 three lead gutters (h h h) should be wide enough in the centre 

 to admit of a person walking along it. c is one of the cast-iron 

 pipes, a pillar 9 ft. long, supporting the beam, and having 

 five small wooden shafts round it, to train climbing plants 

 upon. The ventilating shutter (I x) works upon two pivots, 

 and is raised by a wooden rod, which also props it open. 



