By Joseph Sabine, Esq. 



87 



bability, therefore, is, that the unnecessary width of the lap, 

 in Mr. Taylor's lights, allowed of the formation of ice in 

 the narrow space unoccupied by the putty in the middle of 

 the lap, and the circumstance of so many panes being 

 broken in the centre seems to corroborate this conjecture. 

 The cutting of circular glazing from square panes is admi- 

 rably performed, by means of the trammel described by Mr. 

 Gowen, in his Paper above referred to ; though, when 

 glass is so cut, it is attended with considerable loss and ex- 

 pense; but I find that the glass cutlers supply circular- 

 edged panes, of equal dimensions to the square ones, at a 

 very small additional charge ; they cut these out of the whole 

 sheets of glass, by the assistance of a wooden pattern, hav- 

 ing an edge with the required curvature, and thus the con- 

 cave and convex ends of the panes exactly match each 

 other. 



The Glazing recommended by Mr. Taylor is with Rhom- 

 boidal panes. The top and bottom of each pane are cut 

 parallel to each other, in a slanting direction from side to 

 side. For the sake of neatness of appearance, the slopes of 

 the panes, in glazing the lights, are turned * towards each 

 other in the contiguous ranges of panes. The laps are put- 

 tied, except about one inch at the lower part of each slope, to- 

 wards which the condensed steam from the inside runs rapidly, 

 and, with the external water, passes down the outside of the 

 glass, at the edge of the adjoining bar. Mr. Taylor's Conser- 

 vatory was covered alternately, with lights glazed in this man- 

 ner, and with the circular glazing ; and in the winter in which 

 the injury mentioned was sustained amongst the circular 



* Sec Plate III. Figure 3. 



