60 IMPROVEMENT IN DOORS. 



that he found it to answer to his satisfactios, both in per- 

 mitting the doors to pass clear of the carpets, and in keep- 

 ing out the air. 

 The method Mr. Tad's invention consists in first cutting away the 



bottom of the door, so that it is about one inch and a quar- 

 ter above the floor ; this allows a sufficiency of room for 

 the door to open over any carpet. To close the opening 

 v/hich would now be left under the door when shut, he pro- 

 poses to fix beneath the door, by means of hinges, a slip of 

 wood, of which a b d e, figs. 2 and 3, Plate II, is a sec- 

 tion. Fig. 1 is a perspective view of the bottom of a door, 

 with the invention annexed to it ; fig. 2 is a section across 

 the door when closed ; fig. 3 is a view of the edge of the 

 door when open ; and fig. 4 is a section supposed to be 

 made by cutting the door in two parts, edgeways. The 

 hinges on which the slip turns, are fixed to the edge. In 

 figs. 2 and 3, from a to b is exactly one inch and a quarter, 

 so that when the ruler is turned down upon the hinges, it 

 reaches the floor A A, as in fig. 2; in the other direction 

 ad it is much less, being only half an inch, so that when 

 it is turned up under the door, as in fig. 3, it leaves three 

 quarters of an inch clear of the floor. It now remains to 

 show how the ruler is turned up or down ; it has always a 

 tendency to rise up into the state of fig. 3, by the action of 

 a steel wire spring, shown in figs. 2 and 4, which is con- 

 cealed in a rebate cut in the bottom of the door; one end 

 of the *ire is screwed fast to the door at/, the other is in- 

 serted into an eye fastened into the slip at g. To throw- 

 it down into the position of figs. 2 and 4, the -end h, fig. 4, 

 of the slip farthest from the hinges of the door, is cut into 

 a semicircle, as seen in fig. 3. When the door is just 

 closed, this semicircle is received into a fixed concave semi- 

 circle k, fig. 3, cut in the end of a piece of wood k I, made 

 fast to the door case ; the line m I, fig. 3, represents the 

 plane of the door when shut, and pp part of the door seen 

 edgeways ; as the door in shutting moves from p to m, the 

 .semicircular end of the slip aide presses against the end 

 of the piece k /, and as the door proceeds, it turns down as 

 in fig. 2, so that by the time the door is shut, the slip is 

 tumtd quite down ; the edge e b of the slip is cut into a 



segment 



