5.2.36 - 5.2.38
प्रमाणे द्वयसज्दघ्नञ्मात्रचः
SV: प्रमाणे द्वयसच्-दघ्नच्-मात्रचः
AV: तत् अस्य
Language Meaning: The affixes द्वयसच् , दघ्नश्च and मात्रच् come in the sense of ‘that whereof this is the lineal measure’ after a word in Nominative १st-Case in construction.

Literal Meaning :
प्र of - त्र
Reed inside till संप्रदान (push) - (throw/give wave) connect gathered (wide give/throw) (hunt pull) (net inside) up to (float+water) - knot exist.
Meaning explained - Keep reed inside till it gets a push - throw hunting net on waves

Literal Meaning of linguistic interpretation
प्रमाण Keep reed inside till it gets a push

There are rope-knots to measure depth
द्वयसच् = roll wave (high tide) connect align knot
दघ्नच् = give hunt pull knot
मात्रच = inside up to फ loat + water knot