EXPERIMENT STATION BULLETINS. 



187 



with a small round tube at the top 

 instead of a rose. By means of this, 

 soft putty or thick paint is run into 

 the crack. With this considerable 

 space can be gone over, but when 

 glass is lapped we prefer to bed in 

 putty, and when the glass is butted 

 the small crack between the glass 

 and wood can be closed about as 

 rapidly, more neatly, and with consid- 

 erable saving of paint, if applied with 

 (Fig. 9.-Putty Bulb.) a brush. If the sash-bars received 



two coats of paint before they were glazed, rather thick paint can now be 

 run into the crack and the outer portion of the sash-bars can be given 

 a third coat at the same time. After the above was written we received 

 from John A. Scollay of Brooklyn, New York, one of his improved 

 bulbs for trial. This differs from the other form, in having a small 

 brush fastened to and extending beyond the end of the tube. 

 This is certainly a great improvement over the old putty bulb, and 

 enables one to fill the cracks between the glass 

 and the sash-bars in a neat, effective, and rapid 

 manner. The materials used in making this 

 liquid putty are equal parts of linseed oil, 

 white lead, and whiting, by measure. 



PUTTYLESS GLAZING. 



Various puttyless systems of glazing have 

 been invented. In most of them the glass is 

 clamped down on iron or wooden sash-bars by 

 lead or zinc strips. The theory is all right, 

 but we have never seen a satisfactory roof that 

 was glazed in this way. The panes often 

 slipped down, and cracks between the panes 

 where the corners were not pressed down 

 allowed a large amount of heat to escape. Had 

 there been a more careful oversight and 

 greater attention to the details of construction, 

 we should have undoubtedly been differently 

 impressed by our inspection of the houses. 

 As said before, we believe in this system of 

 glazing, and think that it will soon come into 

 universal use in the construction of large 

 greenhouses and conservatories. 



GLAZING POINTS. 



Of the materials for fastening the panes in (^^g- ^--improved Putty Buib.) 

 place, we have found nothing better than a large-size triangular zinc point. 

 If one of these is driven in at each of the lower corners of the panes so that 

 one point of the zinc will project beyond the lower edge of the pane, this can 

 be bent down with the corner of a chisel and will prevent the pane from slip- 

 ping. We have tried these same points with the corners already bent, but 

 have not been as well satisfied with the results. The use of |- inch wire brads 

 has also given good satisfaction. One of these driven in about half an 



