शुष्कसारदारुमयं समं चतुर्भागशिखं मानं कारयेत् अन्तःशिखं वा ॥ कZ_०२.१९.३४ ॥
śuṣkasāradārumayaṃ samaṃ caturbhāgaśikhaṃ mānaṃ kārayet antaḥśikhaṃ vā
He should have the measuring-vessel made of dry, sound heartwood, even and true, with a rim/projection of one-quarter (as the standard ‘śikhā’), or else with an inward rim (antaḥ-śikhā).
Material prevents warping/shrinkage; standardized rims reduce manipulation and make verification straightforward.