How to schedule Batch Class for every hour in Salesforce?

Sample code:

SampleSchedulableClass obj = new SampleSchedulableClass();

String cron = '0 59 * * * *'
System.schedule('Testing', cron, obj);

Expression	Description
0 0 13 * * ?	Class runs every day at 1 PM.
0 0 22 ? * 6L	Class runs the last Friday of every month at 10 PM.
0 0 10 ? * MON-FRI	Class runs Monday through Friday at 10 AM.
0 0 20 * * ? 2010	Class runs every day at 8 PM during the year 2010.

Cheers!!