the main building brick A by 10 1/2 cubic inches say 10 1/2 ounces
The most serious objection to A being its [illegible] when not [illegible] 
as much as 1 1/2 common bricks. The part taken out will not weaken
A to hurt, and as no hollow shown on upper surface will not make 
any trouble in spreading the mortar. [illegible] one inch layer 
[illegible] all the fine [illegible] of brick of which [illegible] is made 
to be 1/4 inch apart, and mortar will on top and bottom of these [illegible] 
[illegible] so as to look like a solid wall, enough will go into the 
1/4 inch spaces between these walls to keep them from [illegible] together 
and by [illegible] filled into grooves as before described 
we have a wall essentially solid, and yet with [illegible] space 
between all the [illegible] enough to make them admirably nonconducting 
no need of saturated [illegible] such small air 
spaces would be of no account in any way of laying walls 
which did not prevent the mortar from filling up more in 
depth than a proper mortar joint there is [illegible] the
hollow in the [illegible] and that on the inside
space of every A brick. I estimate that in this way a 
14 inch nonconducting wall and yet practically stronger
Van a 12 inch solid wall as commonly built would not 
[illegible] cost as much as the 12 inch solid. It would 
require five bricks to be handled where six of the common 
brick are used to lay the same wall surface. June 20th 1885 
it seemed to me at about 3 AM that since my plan was 
devised of a hollow common rectangular brick for [illegible] 
lining walls in combination with laying all the [illegible] 
together that a miter joint at top and bottom of the corners gives 
all needed strength in addition to so many hollows that the [illegible] 
before [illegible] brick was devised is much simpler and better 
[illegible] with common brick and a [illegible] 



