440 



Recollections of a Tour made in May, 1839, 



Fig. 104. showsa staybar for a door or a gate, in which the wall is on the 

 same plane with the door. In this adaptation of the staybar, the groove in 

 which it slides is made curvilinear, merely to facilitate the operation of sliding, 

 because it would slide if the groove were straight. The curve a b, therefore, 



may have any radius that may be convenient, provided that it commences at 

 b and terminates at a. The points c c c represent projections from the groove, 

 having holes for screwing on a wooden guide-bar, to prevent the staybar from 

 rising out of the groove. 



Fig. 105. is a section of the groove of half the proper size, in which d is the 

 guide-bar of wood screwed on to the groove at e ; f is the opening in the 

 bottom of the groove into which the staybar drops. These openings may 



