PostgreSQL ORDER BY array

How do I ORDER BY the first value in the array values from a column?

Here is an example of the data...

/* machine_number column */
{16,24}
{27}
{19}
{4,10}

So in example I'd like to ORDER BY ? ASC; and have the "following" returned...

/* machine_number column */
{4,10}
{16,24}
{19}
{27}