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Relationship between positive time duration (PTD) and membrane thickness used for different breech lengths. It can be seen that there PTD increases with increase in the breech length for any given membrane configuration; furthermore, for a lower breech lengths, the PTD tends to increase with increase in the number of membranes used, however, this change reduces with increase in breech length. For the maximum breech length, there is no significant change in the PTD.
