IRON POSTS. 
hi 
are made in two parts, one of which can pass within the other 
like the parts of a telescope. These posts, known as Hamilton's 
Standards, are also exclusively employed in British India, where 
the white ant prevents the use of wood. They are composed 
of1st, two tubes, a and l) (fig. 45), of sheet iron; 2nd,* a 
cast-iron foot, c ; 3rd, a plate or disc, d , also of cast-iron $ 4th 
