On Google Books.
William Barnes - dated 1886
Grammer & Glossary of the Dorset Dialect by The Rev William BARNES
YOTING STONE - A stone cistern formerly used in Dorset, as elsewhere, in brewing. etc. etc.
'In the old court books of Frampton Court, kindly put under my hand by Mr Sheridan, I find in some inventories given in on the proving of wills, and the yoating vat was among the brewing utensils, etc. etc. In 1678 we find "two yoating vats; in 1679 "the yoating howse" the mashing house; but in 1682 and 1709 the name "yoating vat" gives place to "meashing vate or vat'"
It does go on to say....
Dr Prior, author of "The Popular Names of British Plants, &c, very kindly sent me some quotations from a book by Gervasse Markham, 1631, who in speaking of brewing, says that of the two kinds of vats or cisterns coopers' work (fatts) of wood, and masons' worke (cesternes made of stone), the cesterne of stone is much the better", and tells wherefore.
The yoting stone was so called from the Saxon geotan. To pour out, and was the mashing vat.
"Ic tears steal geotan"... I shall shed tears...Cynewulf.