opinion: Harry NOVICKI, a Minor, by Harlan Novicki, His Guardian, and Harlan Novicki and Mary Novicki, Appellants, v. BLAW-KNOX COMPANY, a Corporation.
  No. 13671.
  United States Court of Appeals Third Circuit.
  Argued Jan. 12, 1962.
  Decided June 14, 1962.
  Paul E. Moses, Pittsburgh, Pa. (Earl J. Cavanaugh, Evans, Ivory & Evans, Pittsburgh, Pa., on the brief), for appellants.
  Bruce R. Martin, Pittsburgh, Pa. (Pringle, Bredin & Martin, Pittsburgh, Pa., on the brief), for appellee.
  Before BIGGS, Chief Judge and HAS-TIE and GANEY, Circuit Judges.
  HASTIE, Circuit Judge.
  The question on this appeal is whether the evidence warranted a verdict for the plaintiffs in an action against a landowner for negligent injury of an infant trespasser.
  In several respects this case is an almost classic example of injury to a child caused by an attractive nuisance. Appel-lee, Blaw-Knox Co., is a manufacturer whose premises included a large open area near a housing project. In that area appellee was accustomed to assemble and leave bulky machines and materials for which it had no future use pending disposition of the accumulation as scrap or junk. The landowner was aware that children frequently played in this area and upon the discarded machinery. One of these habitues was the minor plaintiff, Harry Novicki. According to his testimony, his parents had ordered him not to play in the area but he had persisted “because it was fun playing on the steel things”.
  The day of the accident was the day following the minor plaintiff’s 10th birthday. He and another boy undertook to play with and upon one of the discard 3d machines in appellee’s yard. The nia-chine was a large press. It was mounted on a low platform one step above the ground. Its operation involved the rotation of exposed wheels that were geared to each other. There was one large wheel about 5 feet in diameter. Its perimeter consisted of cogs that engaged cogs on a smaller wheel immediately below. The wheels were not locked or secured in any way. It was feasible for a boy to grasp a spoke of the large wheel with his hands and to wrap his legs around another spoke. If the wheel was then rotated, the rider would turn in cartwheel fashion.
  On the occasion of the accident the plaintiff and another boy undertook to ride the large wheel in the described manner. The companion rode first. Plaintiff then attempted to ride in the same way. However, there was grease on the spoke of the wheel that he had grasped with his hands. In some manner his foot slipped and his hands lost their grip on the slippery spoke. He fell from the rotating wheel and his hand was mangled between the perimeter of that wheel and the meshing cogs of the wheel to which it was geared.
  Along with a general verdict for the plaintiffs, a jury found specially that the defendant had been negligent and the minor plaintiff had not been contributorily negligent. Pursuant to these findings the jury awarded the minor plaintiff $9000 for injuries involving the amputation of a finger and the mutilation of a thumb. The sum of $1219.47 was awarded to the child’s parents. However, on motion for judgment in accordance with an earlier motion for a directed verdict, the trial court set these awards aside and entered judgment for the defendant. It is from this judgment that the plaintiffs has appealed.
  The accident occurred in Pennsylvania and liability is governed by the tort law of that state. The controlling general principles of law were correctly stated in the charge to the jury and they are not in dispute.
  In Pennsylvania, Section 339 of the Restatement of the Law of Torts, is consistently accepted and applied as an authoritative statement of the principles which determine liability in a case like this. Indeed, the Supreme Court of Pennsylvania has stated explicitly “that § 339 has been adopted in toto by this Court and is the law of this State”. Dugan v. Pennsylvania R. R., 387 Pa. 25, 31, 127 A.2d 343, 346. Accord Hyndman v. Pennsylvania R. R., 1959, 396 Pa. 190, 152 A.2d 251; Thompson v. Reading Co., 1942, 343 Pa. 585, 23 A.2d 729. That section reads as follows:
  “§ 339. Artificial Conditions Highly Dangerous to Trespassing Children.
  "A possessor of land is subject to liability for bodily harm to young children trespassing thereon caused by a structure or other artificial condition which he maintains upon the land, if
  “(a) the place where the condition is maintained is one upon which the possessor knows or should know that such children are likely to trespass, and
  “(b) the condition is one of which the possessor knows or should know and which he realizes or should realize as involving an unreasonable risk of death or serious bodily harm to such children, and
  “(c) the children because of their youth do not discover the condition or realize the risk involved in inter-meddling in it or in coming with the area made dangerous by it, and
  “(d) the utility to the possessor of maintaining the condition is slight as compared to the risk to young children involved therein.”
  On this appeal, the landowner attempts to justify the judgment notwithstanding the verdict on the theory that the jury could not reasonably have found that the requirements of subsections (b) and (c) of § 339 had been met in this case. It is argued that to children in the plaintiff’s class or category the abandoned machine created no “unreasonable risk * * * of harm” within the meaning of subsection (b), apparently because the record was thought to show that the plaintiff could and did, within the meaning of subsection (c), fully “realize the risk involved in intermeddling” with the machinery.
  The court below thought that certain undisputed facts were controlling. The plaintiff admitted that he knew that there was grease on the spokes of the wheel on which he attempted to ride. He also knew that the wheel was somewhat elevated and that gravity would cause him to fall if he should lose his grip. Finally he knew that this wheel was geared to another and that he would be injured if his hand should be placed between the moving gears. But for a child to “realize the risk involved” in his conduct in such a situation as this, it is not enough that he be aware of the separate facts that grease is slippery, gravity pulls a body down and meshing gears can crush flesh and bone. He must also realize that there is a substantial likelihood that his conduct will bring these factors into combined and cooperating effect to his injury.
  Here, the plaintiff knew that a hand caught between the gears would be injured but, in his own words, “we were not planning to stick our hand in the machine”. At another point he was asked: “You knew that if you put your finger in between the gears you’d get hurt, didn’t you?” He answered: “Yes. But we weren’t thinking about getting hurt or nothing”. In other words, overestimating his ability to retain a grip with his hands, legs and feet on the rotating wheel, the plaintiff underestimated the danger that several factors in his situation might combine to bring his hand into contact with the meshing cogs. We think it cannot be said as a matter of law that such childlike behavior and miscalculation were beyond the reasonable anticipation of those responsible for leaving machinery operable and unattended where children were known to play.
  In concluding that the risk was unreasonable, the jury may well and properly have been influenced by the fact that there was an obvious and inexpensive procedure for eliminating it. Here, there was testimony that the wheels of such machinery as this were usually wired down before the machine was discarded on the open lot, and that this process would require only about 30 minutes. However, that simple and customary precaution was omitted in this case. This fact, considered in the light of defendant’s knowledge that children played on and around the machinery, could have led reasonable jurors to find that the defendant failed to exercise due care in all the circumstances. For cases similar to this one, in which the Supreme Court of Pennsylvania has emphasized the ability of an owner of machinery to eliminate the risk of injury to children at small expense and inconvenience, see Thompson v. Reading Co., supra; Reichvalder v. Borough of Taylor, 1936, 322 Pa. 72, 185 A. 270.
  We think the Pennsylvania cases also support our conclusion that the extent of the child’s appreciation of danger in such a situation as this is a jury question. The Supreme Court of Pennsylvania has said that the fact that children have repeatedly engaged in conduct similar to that which caused the harm in question is a factor which a jury may weigh in deciding whether the risk was fully appreciated. Hyndman v. Pennsylvania R. R., supra. Here, one of defendant’s guards, as well as the infant plaintiff and his father, testified that children frequently played on or around this discarded machinery. Moreover, immediately before plaintiff tried to ride the rotating wheel, his companion had done the same thing without mishap.
  More generally, the Pennsylvania courts have repeatedly ruled that the jury should decide the question of a child’s appreciation of hazards which an adult would perceive clearly. In Cooper v. Reading, 1958, 392 Pa. 452, 140 A.2d 792, a 9 year old boy ventured out onto thin ice covering a pool, stamping his feet to test it as he proceeded. In Hyndman v. Pennsylvania R. R., supra, a 12 year old boy climbed a ladder on a railroad right of way to a transformer platform where inadequately insulated wires were within reach. In Bartleson v. Glen Alden Coal Co., 1949, 361 Pa. 519, 64 A.2d 846, a 12 year old boy climbed a tower supporting an exposed high voltage electric wire and ventured close to the wire itself. In Kuhns v. Brugger, 1957, 390 Pa. 331, 135 A.2d 395, 68 A.L.R.2d 761, not an attractive nuisance case, the question arose whether as a matter of law a 12 year old boy must be held to understand the risk of handling and pointing a pistol. In all of these cases the extent of the child’s appreciation of the risk involved in his conduct was held to be a question for the jury. We think these cases strikingly exemplify the extreme reluctance of the highest court of Pennsylvania to have this issue decided as a matter of law. Justice, later Chief Justice, Horace Stem gave expression to this view when he said:
  “ * * * the care and caution required of a child is measured by his capacity to see and appreciate danger, and he is held only to such measure of discretion as is usual in those of his age and experience; this being necessarily a varying standard, the question is ordinarily one for the jury and not for the court * * Patterson v. Palley Mfg. Co., 1948, 360 Pa. 259, 267, 61 A.2d 861, 865.
  Seeking to place this case in a special category, appellee asks that we apply the doctrine of the so-called “falling” cases. Pennsylvania does hold that even rather young children must be held as a matter of law to understand that if one falls from a high place he is likely to be injured. Malloy v. Pennsylvania R. R., 1956, 387 Pa. 408, 128 A.2d 40; McHugh v. Reading Co., 1943, 346 Pa. 266, 30 A.2d 122, 145 A.L.R. 319; Kravetz v. B. Perini & Sons, 3d Cir. 1958, 252 F.2d 905 (applying Pennsylvania law). But in all of these cases it was the height which made the danger great and obvious and should have put even a child on guard. Moreover, it was the impact resulting from the fall that caused the injury. It would hardly be argued that this doctrine applies to the risk of “falling” from the edge of a sidewalk to the street slightly below.
  Here, the platform of the machine was only a step above the ground. And from that slight elevation one could climb directly onto the wheel that plaintiff mounted. The impact of a fall from such a slight elevation would present no substantial risk of serious harm.
  The danger, created by the defendant’s failure to secure its machinery, was that a child playing on the machine or its platform might step or reach incautiously, or lose his balance or be playfully pushed, or in some other way become enmeshed in moving gears located on approximately the level of his activity. Cf. Hyndman v. Pennsylvania R. R., supra; Bartleson v. Glen Alden Coal Co., supra; Reichvalder v. Borough of Taylor, supra. This is quite different from the simple risk of hurting one’s self by falling. In our view the "falling” cases do not control such a situation. The extent of this child’s understanding of the risk of being mangled, as well as the companion question of the reasonableness or unreasonableness of subjecting children to that risk, should have been settled by the verdict of the jury.
  The judgment will be reversed and the cause remanded for the reinstatement of judgment on the verdict.
  . Analytically, tlie argument that plaintiff fully understood but nevertheless subjected himself to the risk of intermeddling ■with the machinery may present an issue of contributory negligence more obviously than an issue as to defendant's lack of due care. This need not concern us because. if the evidence permits a conclusion that the plaintiff did not fully appreciate the risk involved in his conduct, the basic contention fails whether it is related to defendant’s negligence or to plaintiff’s contributory negligence.
instruction: What follows is an opinion from a United States Court of Appeals.
  Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
  When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 
  
  Your task concerns the first listed appellant. The nature of this litigant falls into the category "private organization or association", specifically "business, trade, professional, or union (BTPU)". Your task is to determine what subcategory of private association best describes this litigant.
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