Does a plaintiff have to prove that he was using the machine for the purpose and in the manner normally intended?

Plaintiff also contends that the judgment may stand because the jury specifically found in his favor on the products liability claim and the amnesia charge related only to the negligence cause of action. The court did not limit the amnesia charge to the negligence cause of action, but more importantly, it was plaintiff's burden to prove how the accident happened in both causes of action. Specifically, he was required to prove in the products liability claim that the machine was being used at the time " 'for the purpose and in the manner normally intended' "(Voss v. Black & Decker Mfg. Co., 59 N.Y.2d 102, 106, 463 N.Y.S.2d 398, 450 N.E.2d 204, supra:

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