164 
Gen, Roy’s Account of 
Art. 1 V. Tripod for White Lights, 
Next after the flag-ftaff (whereon a focket for white lights 
could like wife be placed, when the flag itfelf was removed) is 
Teprefented a fnaall tripod intended for white lights only. The 
fame focket that fitted the top of the flag-ftaff, or lamp- port, 
could be applied to the tripod, by the help of three final! 
lockets fold ere d for that particular purpofe to the fides of the 
, principal one. Deal rods, of five or fix feet in height, or ha- 
zels cut from the near# hedge, ferved as the legs of this {land. 
The fockets themfelves were made of copper, becaufe thofe of 
iron would have been difiblved by the fulphur ; and the upper 
part, which was only an inch, or an inch and an half, in 
height, was fquare or round, according to the figure of the 
boxes containing the compofition, fometimes of one kind, and 
fometirnes of the other. Thefe white-light tripods, being 
readily placed by the help of a plummet over the point mark- 
ing the Ration, were found to be very convenient on the top 
of an open hill, or on the leads of a church fteeple, as the 
perfon attending them could eafily light the box with the port* 
fire, without the aid of a ladder. 
Art. V. Portable Crane . 
On the right hand fide of the plate is reprefented, in plan, 
and fe&ion, and by a larger fcale thaU the others, a portable 
crane for weighing up the inllrumenc to the tops of fuch 
towers, church ileeples, or other buildings, as became Rations 
in the feries of triangles. It was conflrudled in the Tower of 
London, and anfwered very well the purpofe for which it was 
intended, although it might ftill be improved. Before we 
were 
