88 



Observations on the Glazing of Hot-houses. 



panes, no fractures occurred in the others. The three ranges 

 of lights glazed with the rhomboidal glazing, in the garden 

 of the Society, were not injured by the frost of the past win- 

 ter; but it will be recollected, that the circular glazing also 

 escaped damage equally ; both were fixed with laps of one- 

 eighth of an inch width ; Mr. Taylor's laps were in both 

 cases half an inch wide, so that it is clear that the rhom- 

 boidal glazing was relieved from the water which froze in his 

 circular-edged panes. This, according to Mr. Taylor's ob- 

 servations, is caused by the attraction of the bars, which 

 carry off the water as fast as it collects in the laps. If the 

 panes for this mode of glazing were to be formed from 

 the glass originally cut into squares, as it is usually procured, 

 there would be more waste of glass than even in the circular 

 edged panes ; but they may be cut out of the entire glass 

 without waste, and this being done by a pattern, they would 

 all match or fit with perfect exactness. 



The rhomboidal glazing seems, so far, to be very good ; 

 but it is open to one strong objection, common to it and, in 

 some degree, to the horizontal glazing, and which it is the 

 direct intention of the circular glazing to meet and re- 

 medy. The constant run of the water along the edge of the 

 bar must tend not only to detach the putty from it, but to con- 

 duce to the more rapid decay of the bar itself; and should the 

 putty become in the least disarranged, it is most probable 

 that the water would pass through it, and drip into the house 

 under the bar. It sometimes also happens, with this mode 

 of glazing, when the lap is very narrow, and the wind is high 

 from a southern point accompanied with rain, that wet 



