Reference for Chullin 31:5

השוחט במוכני שחיטתו כשרה

But was it not taught [in another Baraitha] that the slaughtering is invalid? - It is no contradiction, for the former [Baraitha] deals with a potter's wheel,<span class="x" onmousemove="('comment',' A wheel turned by the hand of the potter, in which case the slaughtering is valid. It is suggested, however, that even in the case of a potter's wheel the slaughtering is valid only if the throat was cut by the first revolution of the wheel. The subsequent revolutions are not directly referable to the human act. V. comment of R. Jonah on Ber.; end of chap. VIII.');">³</span>

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