480 
*N*ew Meld Gate. 
the gateway than this mark, drive in the lower hook ; 
this hook must project about half an inch farther from 
the face of the post than the upper hook. In the section 
or ground-plan of the gate, the two white circles near 
the hanging-post represent the places of the two hooks 
when brought to the same horizontal line ; that nearest 
the gateway represents the place of the upper hook. A 
line drawn through the middle of these two circles, and 
extended each way, will, on one hand, represent the 
gate ? s natural line of rest, and, on the other, the line of 
its highest elevation. A gate thus hung will, when 
thrown open nearly to the line of its highest elevation, 
return to the falling-post with a velocity sufficient to re- 
sist a moderately strong wind. This velocity will be 
either increased or diminished, accordingly as the upper 
hook declines more or less from a position perpendicu- 
lar to the lower hook. In order to adapt the thimbles 
to these hooks as the lower hook is one inch and a 
half farther from the gateway than the upper hook, the 
lower thimble must have its eye an inch and a half far- 
ther from the heel of the gate than the eye of the upper 
thimble, in order that the bars of the gate may be in a 
horizontal position when it is shut. And, as the upper 
hook projects half an inch less from the hanging-post 
than the lower hook, the upper thimble should be fixed 
half an inch nearer the farther side of the heel of the 
gate than the lower thimble, in order that the gate may 
be in a perpendicular position when shut. If the thim- 
bles have straps embracing the heel of the gate, and pro- 
ceeding a few inches along each side of the bottom and 
top bars, and if they are fixed to the heel bars and braces, 
by means of iron pins and screw nuts, great firmness will 
be given to the gate at those two points, w hich are those 
that suffer the greatest strains. 
END OF VOLUME SECOND, 
