Greenhouse Construction. 17 



Double thick glass, 16x20, is too heavy to lap in the 

 usual wAy and keep in place. Neither is butted glass 

 desirable on account of the great amount of leakage, 

 but this can be obviated] 

 by using a zinc joint, an ' 

 invention of Mr. J. M. 

 Gasser, of Gleveland,Ohio. 

 See Fig. 14. I have used 

 these for several seasons, 

 as I have been repairing, Fig. 14. 



and like them very much. Where the glass is not 

 lapped, as is the case when these joints are used, the 

 putty can be applied to the bars with a, machine, saving 

 the work of two men, and again, after the glass is set, 

 the corners can be drawn on the outside by the same 

 process, filling any space there may be at the edge of 

 the glass, thus making a perfectly tight roof. As fast 

 as the glass is laid it should be fastened with glazier's, 

 points. No. 00, as its weight will otherwise cause it to 

 buckle and slide. 



I once heard a careless workman say, "paint and 

 putty are great rectifiers," and while open joints are to 

 be deprecated, should they occur through accident or 

 otherwise, see that they are carefully filled, and that all 

 nails about the gutters are well set and the holes puttied 

 before giving the final coat of paint. Every season as 

 the houses are replanted, the gutters, both inside and 

 out, as well as the foot of the bars where they join the 



