By James Robert Gowen, Esq. 247 



withdrawn, after the pane is pressed down to its bearing, 

 will leave an aperture for the escape of the condensed mois- 

 ture within, and with this precaution, little or no drip will 

 take place. The advantages of the circular glazing arc so 

 great and obvious, it is so much neater in appearance, and 

 attended with so little additional expense, that no person 

 after trying it, or seeing it in practice, will think of following 

 the ordinary method. A person at Birmingham has obtained 

 a patent for what he terms Shield Glazing. He cuts the 

 edges of the pane, not into a curve, but into an angular 

 form, with a small semi-circle at the vertex of the angles ; it 

 is evident that this scheme is but a modification of the circu- 

 lar method, over which it possesses no apparent superiority, 

 and it is certainly more difficult of execution. 



Some practical observations may not be useless : they are 

 applicable to any species of glazing. In preparing the putty, 

 the oil should be old, and the whiting thoroughly dry ; a short 

 exposure to fire heat is insufficient, it should be kept in a 

 very dry place for a considerable time, moisture adhering to 

 it with great obstinacy. The putty should be prepared in 

 quantity some time before it is used, and allowed to remain 

 in a mass ; the more it is beaten the better it will be. When 

 the lights are finished, they should not be put upon the 

 house till the putty be well hardened, for if exposed to rain 

 or frost prematurely, it will never acquire that solidity which 

 it would under opposite circumstances : striking instances of 

 this fact have fallen under my observation. The putty 

 should not be painted till it begins to acquire a hard and dry 

 surface. After the panes are bedded in the putty, and be- 

 fore the front putty is laid on, it will be a great improvement 



