out any Catch, or the lead Danger of the Weight 
falling back again. 
But then, if you wouM have the Weight to be let 
down, to defc'end pretty quick, -which -’cannot be per- 
form'd by applying" the Hand to the Handle, which 
goes through a' great ’ Space in Comparifon to the 
Space defcribM by thoWeight ( without which fuf- 
ficient Force would be wanting ) only give the Han- 
dle a Swing, and if the- Worm be well oil’d; the Han* 
die and its Counterpoife, or the two Handles, will 
perform the Office of a Fly in the commcm Jack, 
turning very fall round, and regulating the Motion 
of the Weight, which from that Impulfe will de- 
fcend continually, and ,not too fad, like the Weight’ 
of a Jack. ' ^ " ‘ 
The Way to dop this Motion at any Time, is 
to grafp the Axis of the Screwr hard, betwixt the 
Screw and the Handle in its round Part. The Hand 
is fufficient to do it, and will dop it in two or three 
Turns.' ' ' - r ' 
N, ^,^Such Crane may he feen at Mr, GrayX 
Tjoho makes them to felly at Mill-Bank, Wed- 
minder. 
The word Cranes are thofe where Men walk iri‘ 
a large Wheel,' by ieafon of Accidents that happen 
daily on account of the fhort Space between a Man’s 
two Feet. This may be- prevented by ufing four 
footed Animals, the Length of whofe Bodies makes 
a Bafe of fufficient Length to keep the Wheel from 
running back, Fig* 7. ' ^ - . . , , 
* -.1 - 1 : • ■ ' 
