.'[ 46 ] 
building j from the bottom of which wells, fimilar 
conductors fliould be carried up to the eaves, there 
joining well with a plate of lead, extending on the 
roof up to the leaden coping of the ridge, the laid 
plate of lead being of equal fubftance with that of 
the coping. 
We are further of opinion, that it will be right 
to form a communication of lead from the top of 
the chimney of the proof-houfe to the lead on its 
ridge, and thence to the lead on the ridge of the 
corridor, and thence to the iron condudor of the 
adjacent end of the magazine ; and alfo to fix a con- 
dudor from the bottom of the weather-cock fpindle 
of the clock-houfe, down on the outfide of that build- 
ing, into the moifl earth. 
As to the board-houfe, we think it already well 
furnifhed with condudors, by the feveral leaden 
communications above-mentioned, from the point 
of the roof down into the water, and that, by its 
height and proximity, it may be fome fecurity to the 
building below it j we therefore propofe no other 
condudor for that building, and only advife ereding 
a pointed iron rod on the fummit, fimilar to thoi’e 
before defcribed, and communicating with thofe 
condudors. 
To thefe diredions we would add a caution, that, 
in ail future alterations or repairs of the buildings, 
fpecial care be taken that the metalline communica- 
tions be not cut off or removed. 
It remains that we exprefs our acknowledgements 
to Sir Charles Frederick, Surveyor-general of the 
Ordnance, for the obliging attention with which he 
entertained 
