Once the first and second level face mats are so placed, {HEAD ~ compaction} of backfill soil behind the second level mats forces the second level face mat to a generally vertical disposition and, in turn brings the upper fingers {TAIL ~ F1} of the lower face mat and the lower fingers F2 of the upper face mat into engagement with the transverse wires 38, 39, 40 and 41 
Once the first and second level face mats are so placed , { HEAD ~ compaction } of backfill soil behind the second level mats forces the second level face mat to a generally vertical disposition and , in turn brings the upper fingers { TAIL ~ F1 } of the lower face mat and the lower fingers F2 of the upper face mat into engagement with the transverse wires 38 , 39 , 40 and 41
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