METHODS OF SAMPLING AND TESTING HIGHWAY MATERIALS 33 
■L Sheet Iron, 
Rolled 
Iron, 
Rolled. 
x J "Square 
Head 
^'x I "Steel Pipe Bolt 
Top View. 
Side View 
Fig. 10. — Type of mold 
II? 
; 
: 
K 
:-: ; 
:-i—Z- 
:".■ 
- 
- 
:-zzzzzzz: 
: : - 
:::E5:: 
■ 
--__.. 
- :z::i7- 
> " 
:rr;;.: 
C ^ 

O - 
t - 
to 
\j : 
.;::: 
c : 
::: 
* >J - 
c 
J 
c> 
~ 
<o 
V 
-<3 
5 
O 
-r:. 
::::rr-- 
zzz~zzzz\ 
-■~: 
zzzzzzzzzz'. 
•--==- N 
-■ 
Lightly 
Soldered 
or 'Laced with Wire 
Staples. 
Top View. 
Materiah 
No. 20 Gage 
Galvanized 
Steel or 
Waxed Board. 
Side View. 
164022°— 28 3 
Fig. 11.— Type of mold 
