His Jewel is the Level...symbolizing that all Masons meet on the level, without regard to social, political or religious beliefs or status.

The Senior Warden of a Masonic Lodge is the second in command within the Lodge Officers.

In the absence of the Worshipful Master, the Senior Warden assumes the Worshipful Master’s duties. The Senior Warden of a Masonic Lodge sits in the West (symbolic of the setting sun) and assists the Worshipful Master in opening and closing the Lodge.

The Senior Warden is in charge of the Lodge when it is at labor. His position is similar to a Vice-President of any organization.

His ancient duties were to pay the Craft (the members of the guild) their wages and to handle disputes among the workers. It is his duty to support the Master and to prepare himself for that office during the following year.

Read more: http://www.masonic-lodge-of-education.com/lodge-officer-duties.html#ixzz4CKTWIyP4