Messrs. Drummond's Agricultural Museum. 



601 



Web Harrow. Used for covering grass seeds. This imple- 

 ment is newly invented by Mr. Smith ; it produces the effect of 

 the bush harrow in a perfect manner. 



Gate Latch. (Jig. 73.) a b is a bolt for screwing into the 

 gate post, and c d e a bolt for screwing into the gate. In 

 shutting, the cylindrical iron or bolt e strikes against the part f 

 of the latch f g h, which, being jointed at i, is moved through 



UTi 



Fig. 73. Gate Latch. 



an opening in the plate into the position of the dotted lines k, I, 

 until, on the bolt passing, it resumes its place by its own weight ; 

 and, the part n of the latch m n o opposing further progress, 

 the bolt remains fixed ; and vice versa in shutting from the other 

 side. In opening, the proper latch can easily be raised by the 

 hand or a whip-handle, &c. This kind of latch is found very 

 convenient for common field gates, and does not soon get out of 

 order. 



Casts from the Sculptures and other Ornaments on the Walls 

 qf Stirling Castle. 



Models of Cottages and Moss-Houses. 



Suspensio7i Beams used in the construction of the staircase, 

 &c. 



Moadmaker's and Drainers Sector and Plumb Ride. (fig. 74.) 

 This instrument consists simply of a piece of board, l£ in. 

 thick, the upper end pierced for the sight in the direction of the 

 dotted line a b ; the hole fitted for the eye at a, the cross wire 

 being at b. A saw draught is passed from c to d, from which 

 the plummet (e) is suspended, f g, an arc of a circle described 

 about the centre d, and divided into ten degrees, commencing 

 from the perpendicular indicated by the plumb line, each degree 

 having subdivisions of ten minutes; h, a hole cut through the 

 board to allow free motion to the plummet; z, k, two legs, 

 which are stretched out in setting the instrument, the narrowed 



