50 Mr Robison's Method of fixing Glass in painted Windows. 



Art. VII. — Account of a MeMd of fixing the Glass in paint- 

 ed Windows without the interruption of Astragals. By 

 John Robison, Esq. F.R.S. Edin. Communicated by the 

 Author. » 



Dear Sir, — A method has occurred to me of fixing the glass 

 of painted windows without the usual interruption of the as- 

 tragals of the sash, which so disagreeably divide the picture. 

 I subjoin a slight sketch and description, from which you will 

 judge whether the thing be sufficiently deserving of notice to 

 merit a place in your Journal.— I am, my Dear Sir, very truly 

 yours, 



John Robison. 



I propose that there should be a cast iron frame or graU 

 ing filling up the whole opening of the window ; that this 

 frame should be mounted with a set of hammered iron studs, 

 similar to one or other of those in Plate I. Fig. 6. ; these 

 studs (projecting like the teeth of a harrow) to be so placed 

 as to correspond with the corners of the panes ; their form 

 to be as represented in the drawing, with a stout square 

 or round shank ; their inner ends having a shoulder |, a 

 neck J, and a screwed point with a circular nut |ths in dia- 

 meter. 



The panes of glass should be prepared by having a small 

 portion (J of an inch) cut off from each corner, so that if 

 four of them, were laid close together on a table, there would 

 be a square aperture (at the point where the four corners 

 meet) just large enough to allow the passage of the neck of the 

 stud. See Fig. 8. 



It will be evident, that with this preparation 'each pane 

 would be firmly supported at its four corners, by means of 

 the studs and the screwed nuts ; and that, to an eye placed 

 inside the window, nothing of the support would appear on, 

 the picture, excepting the small nuts at the intersections of 

 the panes, many of which may be contrived by the painter to 

 form parts of the subject. The edges of the panes would, 

 of course, be in immediate uninterrupted contact. 



As the shadows of the outer frame would have the same 

 disagreeable effect during sunshine as those of the wire guards, 



