GLASS AND GLAZING. 



543 



often has to be done during winter when 

 accidents occur, the rebate should be tho- 

 roughly dried by searing it with a hot 

 iron -before the square is put in. 



Reversing the position of the sash-bar. — 

 About six years ago we observed an expe- 

 riment being tried in the gardens at 

 Hungerton Hall, by reversing the sash- 

 bar, and so placing the rebate under the 

 sash instead of above it. The intention 

 was to preserve the putty from the action 

 of the atmosphere. The glass, of course, 

 was put in from below instead of from 

 above— a process attended with much 

 trouble to the glazier. The success of the 

 plan we have not since been able to learn; 

 we anticipate, however, no advantage from 

 the principle. 



Rishtons registered sash, for conserva- 

 tories, vineries, greenhouses, and hotbeds, 

 &c, will be understood by a glance at our 

 figures and the following description : — 



Fig. 765 is a complete frame in plan ; 



fig. 766 a longitudinal section of the 



„ _ same : and fig. 



Fig. 765. 767 > longit °_ 



dinal section of 

 part of a frame, 

 constructed ac- 

 cording to this 

 design, a a are 

 the styles and 

 astragals of the 

 frame ; b b cross 

 bars of thin me- 

 tal, which receive 

 the upper ends of 

 the squares of 

 glass, and form 

 a receptacle for 

 putty round the 

 glass at that 

 part, while at the 

 same time they 

 give additional 

 strength to the 

 frame itself. The 

 super-incumbent 

 square of glass a 

 is kept a very 

 short distance 

 clear of the bar 

 b, which arrange- 

 ment prevents 

 the collection of 

 water and disco- 

 loured matter at 



the laps, and also the breakingof the glass 

 by frost, while at the same time ventila- 

 tion is facilitated, and any square of glass 

 may be removed without disturbing the 

 others, c is a strip of angle-shaped metal, 

 to carry the water outside when it arrives 

 at the bottom square. 



Alfred Kent's new mode of glazing hot- 

 houses, exhibited in the Crystal Palace, 

 and provisionally registered, is thus de- 

 scribed by the editor of " The Gardeners' 

 Chronicle :" — " This method of glazing may 

 be thus described : Suppose two squares of 

 glass, each 2 feet long, are laid flat, edge 

 to edge, on the grooved sash-bars ; then, 

 about 3 inches from each end of the 

 square, a small copper bolt is driven 

 through the bar from the under side ; the 

 edges of the squares are brought up to the 

 sides of the bolts, and a strip of vulcanised 

 india-rubber, about three-quarters of an 

 inch wide, and the length of the square, 

 is carried along the joint so as to cover it; 

 on the top of this india-rubber is placed 

 a strip of thin iron the same length as 

 the square ; and finally, the whole is se- 

 cured by screwing a copper nut upon the 

 copper bolt. It is to be observed that 

 this nut is necessarily made of copper, 

 otherwise, being on the outside, in four or 

 five years' time, when such a house would 

 want painting, there would be no getting 

 the nuts unscrewed, as must be done, it 

 being necessary to remove all the glass 

 previous to painting the bars." The prin- 

 cipal objection to it, the authority above 

 quoted states — and to this we would add, 

 the liability of the iron capping to cor- 

 rode — " is its cost, which must at first be 

 higher than ordinary glazing. On the 

 other hand, it certainly possesses some 

 advantages, especially in repairs, the 

 whole process of unputtying and puttying 

 being done away with. It will, however, 

 be indispensable that due provision be 

 #made for the expansion and contraction of 

 the iron straps which are placed in the 

 glass joints, otherwise the straps will 

 cockle, or the copper bolts break, and the 

 roof become leaky, or be blown away." 



As to the peculiar merit of the grooved 

 bar above alluded to, and on which Mr 

 Kent rests that portion of his invention 

 which guards against leakage, the escape 

 of evaporation, and a more complete sys- 

 tem of ventilation, it has, we think, been 

 so completely exemplified before, as to 



