With the increse in gauge number, the thickness of sheet metal - 

Explanation:

Standard wire gauge (SWG):

• The job draws indicate only the gauge or thickness of the sheet to be used.
• Before starting the work identify the correct thickness of the sheet.
• The thickness of the sheet is measured with the help of the standard wire gauge.
• With the increase in gauge number, the thickness of sheet metal decreases.
• The gauge consists of a disc shape-smoothened steel metal piece with numerous slots around the outside edge.
• These slots are of various widths and correspond to certain gauge numbers.
• The gauge number is stamped on one side of each slot and on the other side, the decimal part of an inch is stamped to show the thickness of the sheet and the diameter of the wire.
• The thickness of the sheet is checked by inserting the edge of the sheet in the appropriate slot of the standard wire gauge.
• Wire diameter is checked by inserting the wire only in the slot, and not in the circle.