IRON ROOFING AND SAWN TIMBER. 89 
CORRUGATED IRON ROOFING. 
(From Ferguson's Ceylon Directory, 1872.) 
The following piece of useful information from 4 
practical planter has been lying by us for a consider- 
able time. In working up papers connected with our 
Handbook it comes before us again, and doubtless 
the suggestion will still be useful to many planters. 
Our correspondent writes :—‘‘In your Useful Memo- 
randa (see page 79), under the heading of ‘‘ Corrugated 
Iron Roofing,” you say the sheets should be double 
rivetted ; now rivetting spoils the iron for after use, 
é.e., some of the rivets generally refuse to come out 
from rust, hence in removing the iron that part will 
tear. Now, to prevent this, there is a better plan 
which I think ought to be in your useful book; 1% 
is this: instead of the rivet use a clip 
> 3) 
a a Hi : 
something like the above. The space from B to A 
going over, round, and under the reeper upon 
which the iron is laid, the top of the first sheet of 
iron goes under the part of the clip B C, and the 
bottom of the second row of iron slips into the part 
D E. On the lower side A the clip ought to have a 
small nail into the reeper; for the first row of the 
iron the clip ought to be merely, as it holds only 
LS 
the one by the above methods. By the simply remov- 
ing of your ridging, you can take off your roofing 
without injury to a single sheet; ? inch good hoop 
iron is the best size for the clips=two clips for each 
sheet : 
Clip No. 1. No. 2: 
{aes 
HOW TO MEASURE SAWN TIMBER. 
Rakwana, 27th July 1871. 
The prevailing practice in this district in the mea- 
suring of sawn timber is to measure the breadth only 
of all planking under 2 inches thickness; over 2 inches, 
the breadth and thickness ought to be measured. In 
the case of reepers from 2 to 3 inches broad width, 
4 
