52 



HOTBED AND COLD FRAME 



When the frame is made of wood, crossbars should be pro- 

 vided because they possess many advantages. The chief use 

 of the crossbars is to strengthen and to prevent the frames 

 from warping or twisting out of shape when they are 



Fig. 11. — A cross-section of a concrete hotbed. 



in contact with the moist earth. The crossbar should be 

 made of a piece of wood 2x3 inches. It should be of the best 

 material. The crossbars should be placed with the greatest 



Fig. 12. — Showing the method of constructing a concrete hotbed. Note the 

 framework which is necessary. 



care and precision, because if they are too close together the 

 sash will bind and cause great annoyance. The distance from 

 center to center of the crossbars should be one-half inch more 

 than the width of the sash to insure ease in manipulation. 



