[ 88 4 3 
v r, 
XL. Defcription of a ntojl effectual Method of fe curing 
Buildings againfl Fire , invented by Charles Lord 
Vifcount Mahon, F. R. S. 
Read July 2 3 1778. 
§ 1. r pHE new and very Ample method which I have 
difcovered of fecuring every kind of building 
(even though conftrudted of timber) againfl all danger 
of fire, may very properly be divided into three parts; 
* 
namely, under-flooring , extra-lathing , and imer-fecur- 
ing-, which particular methods may be applied, in part 
or in whole, to different buildings, according to the va- 
rious circumftances attending their confirmation, and 
according to the degree of accumulated fire, to which 
each of thefe buildings may be expofed, from the dif- 
ferent ufes to which they are meant to be appropriated. 
§ 2. The method of under -flooring may be divided 
into two parts; videlicet , into Jingle and double under- 
flooring. 
The method of Jingle under-flooring is as follows. A 
common ftrong lath, of about one quarter of an inch thick 
4 (either 
