The plaintiff was injured when a hydraulic cylinder manufactured by Victor Equipment Company (Victor) failed, and the truck tailgate lift, manufactured by Santa Anita Manufacturing Corporation (Santa Anita), on which he was standing, collapsed. Both defendants appeal from judgments for the plaintiff entered after the jury, in answers to special questions, found that each was negligent (Santa Anita 15 % — Victor 80 %1) and that there was a causal relationship between the negligence and the plaintiffs injuries. They also appeal from the denials of motions for a new trial. Santa Anita also appeals from the judgment against it on its cross claim against Victor, and from denials of its motions to alter and amend the judgment and for a new trial.
1. There was no error in the denial in the case in chief of the defendants’ motions for directed verdicts and for judgments n.o.v. The case was submitted to the jury on a theory of negligence. We view the evidence in the light most favorable to the plaintiff to determine whether “anywhere in the evidence, from whatever source derived, any combination of circumstances could be found from which a reasonable inference could be drawn in favor of the plaintiff.” Raunela v. Hertz Corp., 361 Mass. 341, 343 (1972). “Usually ‘the question of negligence is one of fact for the jury. Only when no rational view of the evidence warrants a finding that the defendant was negligent may the issue be taken from the jury’” (citations omitted). Mullins v. Pine Manor College, 389 Mass. 47, 56 (1983), quoting from Zezuski v. Jenny Mfg. Co., 363 Mass. 324, 327 (1973). The standard to which the defendants are held is that of ordinary, reasonably prudent manufacturers in like circumstances. Back v. Wickes Corp., 375 Mass. 633, 643 (1978).
*945There was evidence from the plaintiffs expert (see Wiska v. St. Stanislaus Social Club, Inc., 7 Mass. App. Ct. 813, 821 [1979]), and others from which the jury could find that the hydraulic cylinder, which failed and caused the tailgate lift on which the plaintiff was standing to fall to the ground, was negligently designed or negligently manufactured, or both, by Victor. On the question of negligent design, there was sufficient evidence to permit the jury to consider “the gravity of the danger posed by the challenged design, the likelihood that such danger would occur, the mechanical feasibility of a safer alternative design, the financial cost of an improved design, and the adverse consequences to the product and to the consumer that would result from an alternative design.” Back v. Wickes Corp., supra at 642, quoting from Barker v. Lull Engr. Co., 20 Cal.3d 413, 431 (1978). See Smith v. Ariens Co., 375 Mass. 620, 624 (1978); Uloth v. City Tank Corp., 376 Mass. 874, 881 (1978); McLeod v. White Motor Corp., 9 Mass. App. Ct. 132, 135-136 (1980). The opinions of the plaintiff s expert did not rest on speculation but on adequate evidentiary support. See Carey v. General Motors Corp., 377 Mass. 736, 741 (1979); Gynan v. Jeep Corp., 13 Mass. App. Ct. 504, 509 (1982). Victor’s argument that there may not be a finding of negligent design without evidence of industry standards is without merit. While evidence of industry standards may be relevant and useful, it is not essential and, in any event, it is not conclusive. See Torre v. Harris-Seybold Co., 9 Mass. App. Ct. 660, 671-673, 677 (1980). See also The T.J. Hooper, 60 F.2d 737, 740 (2d Cir.), cert. denied sub nom. Eastern Transp. Co. v. Northern Barge Corp., 287 U.S. 662 (1932).
There was ample evidence from the plaintiff s expert and others, with respect to the manner in which the cylinder had been assembled and welded, from which the jury could find that the hydraulic cylinder had been negligently manufactured by Victor. It was not necessary to such a finding that there be evidence of industry standards of manufacture.
There was sufficient evidence from which the jury could find that it was more probable than not that the plaintiff s injuries were caused by the negligence of Victor. See Carey v. General Motors Corp., supra at 740. Victor’s argument that the evidence established intervening negligence, an argument not made to the trial judge (see Uloth v. City Tank Corp., supra at 883), is without merit.
There was evidence from which the jury could find that Santa Anita was negligent in failing adequately to test the hydraulic cylinder which it installed in the tailgate lift manufactured by it. The stress test which Santa Anita did use would not necessarily detect a defective weld. There was expert testimony that a nondestructive ultrasonic examination, which had been in use since 1948 and was known to Santa Anita’s president at the time of manufacture of the cylinder, would detect such a defect. As in the case against Victor, the absence of evidence of industry standards is not controlling. See Torre v. Harris-Seybold Co., supra at 677, and cases *946cited. The jury could consider the totality of the circumstances and conclude that the failure to use the ultrasonic test was unreasonable. See Sieracki v. Seas Shipping Co., 149 F.2d 98, 100 (3d Cir. 1945), affd 328 U.S. 85 (1946).
Richard E. Bachman (Jerry E. Benezra with him) for Santa Anita Manufacturing Corporation.It was also for the jury to determine the adequacy of the warning notice provided by Santa Anita. Santa Anita knew that drivers rode on the tailgate lifts and that there would be a collapse if the hydraulic cylinder failed. The warning was, at best, ambiguous. See McLeod v. White Motor Corp., supra at 136; Fiorentino v. A.E. Staley Mfg. Co., 11 Mass. App. Ct. 428, 434 (1981); Kalivas v. A.J. Felz Co., 15 Mass. App. Ct. 482, 487-488 (1983).
There was sufficient evidence of causal relationship between Santa Anita’s negligence and the plaintiffs injuries. See Carey v. General Motors Corp., supra at 740.
2. For the reasons previously stated, there was no abuse of discretion in the denials of the motions for a new trial in the case in chief on the ground that the verdict was against the weight of the evidence. See Hartmann v. Boston Herald-Traveler Corp., 323 Mass. 56, 60-61 (1948). We have reviewed all of the evidence and find no abuse of discretion in the denial of Victor’s motion for a new trial on the ground of excessive damages. See doCanto v. Ametek, Inc., 367 Mass. 776, 787 (1975).
3. Santa Anita’s attack on the verdict against it on the cross claim against Victor, on the basis of an alleged inconsistency between jury answers to special questions and the verdict (Mass.R.Civ.P. 49[b], 365 Mass. 813-814 [1974]), is to no avail, since Santa Anita did not file a motion raising the issue prior to discharge of the jury. McCue v. Prudential Ins. Co. of Am., 371 Mass. 659, 663 (1976). The stipulation of the parties with respect to the reasons for the absence of counsel for Santa Anita at the time the jury returned the verdict does not salvage the question. “The rule [49(b)] clearly contemplates a motion prior to dismissal of the jury, for it envisages that the judge may order reconsideration of the answers and the verdict.” Ibid. Moreover, we see no inconsistency. In the cross claim Santa Anita sought indemnity from Victor. The jury specifically found Santa Anita negligent. That negligence necessarily involved the failure adequately to inspect or to warn. “Indemnity is permitted only when one does not join in the negligent act but is exposed to derivative or vicarious liability for the wrongful act of another.” Stewart v. Roy Bros. Inc., 358 Mass. 446, 459 (1970). See Stone & Webster Engr. Corp. v. United Indus. Syndicated, Inc., 16 Mass. App. Ct. 948 (1983), and cases cited.
4. The orders denying postjudgment relief and the judgments are affirmed.
So ordered.
Richard K. Donahue for Victor Equipment Company. Earle C. Cooley for the plaintiff.The plaintiff was found 5% negligent.