There is evidence tending to prove that at the time of the injury a large portion of the framework of the iron ore dock had been constructed to the height of fifty-two feet above the sills, which were two and one-half *338feet aboye the water; that such structure was fifty-two feet wide and one hundred feet long, more or less; that the engine was on the top of such structure, and towards the south end; that one Nelson was'the engineer in charge of and operating' the engine at the time, and had been for two weeks or more immediately before; that the derrick was on the top of the structure, and some fifty or sixty feet north of the engine, and they were both on the same level or plane with respect to each other; that one Maney had charge of the derrick at the time of the injury, and was foreman of the hoisting crew, and his duties included the giving of signals to the engineer and to see that the timbers were put in> their proper place; that Maney at the time was standing on the structure a little north of the derrick, and about seventy-five feet north of Nelson; that the deceased, Carroll Daly, was at the time a little north of Maney, and some fifteen or eighteen feet from him, but upon a portion of the dock then being constructed, and some fourteen feet lower than the top of the structure upon which Maney was standing; that the piece of timber which was at the time being placed was twenty-six feet long and twelve by fourteen inches square, and had been hoisted in the usual way,— that is to say, this piece of timber was in the water near the dock on the east side; that a rope which was attached to the drum of the engine, and thence on or over the several pulleys of the derrick, including the one at the end of the arm or boom of the derrick reaching out over the dock, and from thence down and fastened to the middle, or near the middle, of the piece of timber in the water mentioned; that thereupon the engineer, acting as directed by the foreman by using signals, gradually raised the timber by means of the revolving drum, the' rope and the derrick, with the pulleys and the arm or boom, to the desired height, whereupon one Maloney, who manipulatéd the boom line, and who wás at the time standing on the east side o'f the dock, and about'fifteen feet from *339Maney, and in the neighborhood of eighteen feet from Daly,, with the aid of Daly and others swung the timber mentioned around over the caps upon which it was to be placed; that just before the accident Daly was standing upon a plate about midway between the sides of the dock, with his hands upon this piece of timber, and the timber about as high as his ■ head; that, keeping hold of this piece of timber, he moved two or three steps towards the east side of the dock, when suddenly the engineer, without any signal from the foreman or any one, and without any warning, so operated the engine as to let this piece of timber drop one or two-feet, and the same struck Daly on his right side and knocked him off the plate upon which he was standing, and he fell to the bottom of the dock, some forty feet below, and was so badly injured that he died soon after. There is plenty of evidence tending to prove that the engineer, Kelson, was-incompetent, negligent, and careless, and in the habit of disobeying and disregarding signals, and there is some evidence tending to prove that the defendants and McDonald, their superintendent in the construction of the dock, and whose duty it was to hire and discharge the men, knew of such incompetency, negligence, and carelessness of Kelson prior to the injury.
It is said that the nonsuit was granted on the ground that the deceased, Daly, had the same knowledge, and the same means of knowledge, of such incompetency, negligence, and carelessness of Kelson as. the defendants had. We find no evidence in the record that Daly actually had such knowledge. At the time of the accident he was not where he could see Kelson, and it may be that he was at no time where he could observe, and, if he was, that he did observe, any such misconduct on the part of Kelson. But it is contended that he had the same means of knowledge that the defendants and McDonald had. Their duties, however, wére .general. His duties were to attend to the particular work *340lie was directed to do. The means of knowledge mentioned must have reference to the circumstances which necessarily attended the performance of his duties as such employee. Daly had worked for the defendants about two and-a half months when the injury occurred. Kelson had worked there about two weeks, or a little more. It must be remembered that contributory negligence, when not disclosed by evidence on the part of the plaintiff, is purely a matter of defense, and so the burden is, ordinarily, on the defendant to prove it. Hoye v. C. & N. W. R. Co. 67 Wis. 15, and cases there cited. It is only when the facts and circumstances are not ambiguous, and there is no room for two honest and apparently reasonable conclusions, that a court may properly take a case from a jury. But when, as here, the facts and circumstances, though undisputed, are ambiguous, and of such a nature that reasonable men, unaffected by bias or prejudice, may disagree as to the inference or conclusion to be drawn from them, then the case should be submitted to the jury. Kaples v. Orth, 61 Wis. 533, and cases there cited. As there must be a new trial, we do not feel called upon to say more.
By the Gourt.— The judgment of the circuit court is reversed, and the cause is remanded for a new trial.
MaRshall, J., took no part.