108 



GREENHOUSES 



amount required for the sides and gable may 

 be found in the same way. An inexperienced 

 workman will use somewhat more than this 

 amount as there will be more waste. 



In glazing by the "butted glass" method, 

 putty may or may not be used. When it is 

 used, the method is very similar to that de- 

 scribed above, except that much 

 less is required, as the panes are 

 crowded down to the bottom of 

 the rabbet along their whole 

 length instead of only at their 

 upper end. Sometimes in glazing 

 by this method no putty is used 

 until after the glass is laid, and 

 then a small quantity of liquid 

 putty is forced down along the 

 sides of the glass with a putty 

 Pi g> ~6i. _ bulb. Usually when the glass is 

 Putty bulb butted> the bars are surmounted 



by wood caps. In this system special care 

 must be taken to fasten the lower pane, as 

 the sliding weight of the entire run rests 

 against it. 



Glazing Points. Glazing points are used 

 to hold the glass in place. They may be 

 had in several forms and sizes. A good 

 glazing point is easily driven, does not split 



