What's the difference between sallet and swallet?

Sallet

Definition:

• (n.) A light kind of helmet, with or without a visor, introduced during the 15th century.
• (n.) Alt. of Salleting

Example Sentences:

• (1) The basal strip is bidirectional and the hair cells are covered by sallets.

Swallet

Definition:

• (n.) Water breaking in upon the miners at their work; -- so called among tin miners.

Example Sentences: