This is an action of tort for personal injuries. The plaintiff was employed by the' defendants. His duties were chiefly those of running two elevators alternately, but he testified that he was also to do anything the engineer asked him to do, and always to notify the engineer, one Wright, whenever the elevators got out of repair.
There was evidence that on one or more occasions before the accident the elevator could not be stopped just at the level of the several floors and that it had started without the use of the shipper rope and that on the day of the accident it stopped once two feet above the floor and was repaired by Wright and that *325about three hours later it stopped between two floors but was started again. Wright then went on the top of the elevator and found a screw loose in the dog on the cable, which was a part of the device for stopping the elevator. He then asked the plaintiff to come on top of the elevator with him and hold the dog, while he made fast the screw. The plaintiff asked, “ Is it all right for me to get.up there,” to which Wright replied, “ Yes, it is all right.” As soon as the plaintiff stepped on top of the elevator, “ it shot right up to the roof of the house ” and the plaintiff was injured. This was in substance the testimony of the plaintiff and was uncontradicted as to the way in which the accident occurred.
The declaration contained counts at common law and under the employers’ liability act. There was no evidence that Wright was a superintendent within the meaning of that act.
If the plaintiff had been injured while the elevator was being operated in the ordinary way and for the usual purpose, it is plain that he should have been permitted to go to the jury. The starting of the elevator might have been attributed to the negligence of the defendants. Finnegan v. Winslow Skate Manuf. Co. 189 Mass. 580. Ryan v. Fall River Iron Works, 200 Mass. 188. The same principle would govern, if while repairs had been in progress upon the elevator, it had started by means of some part of the mechanism quite disconnected with that undergoing repair.
The facts in the present case require the application of a different principle. The part of the elevator, which was out of repair, was that by which its starting and stopping were controlled. This was well known to the plaintiff. All machinery in constant use is liable to get out of repair. When this happens, it is the duty of the owner to see that it is put in proper condition. Although that is a personal duty resting upon the proprietor from which he cannot relieve himself by delegating it to competent employees, yet it must often be done through the agency of others. Obviously the owner cannot furnish, to those employed to make repairs, a machine or apparatus in reasonably perfect condition, for it has become unsafe and he is performing his duty by trying to get it repaired. When an injury is caused by the defective condition, which employees in the line of their duty are working to remedy and which they *326know about or have means of discovering as well as the employer and there is no failure on his part to disclose superior knowledge if he has any, then there can be no recovery either at common law or under the statute. The cause of the failure of a device to work properly may often be obscure. If the employee undertakes investigation and repair, commonly he has means of knowledge equal to those of the employer or his superintendent. The master performs his duty if he discloses his knowledge touching the nature of the defect and puts upon the servant the obligation of discovering the cause or remedying the danger. Such a risk is not one as to which any duty rests upon the employer. Whatever gets out of repair must be made whole. Whoever undertakes this work either in a principal or in a subordinate capacity assumes the risk incident to it. He may not appreciate or apprehend the precise manifestation of peril which the accident may disclose, but he knows that danger, latent as well as manifest, may lurk behind the faulty condition. Injury arising out of such circumstances is one of the ordinary risks of the employment, for which no liability arises, and which the employee assumes by his contract of service. The obligation of the master to provide a safe place, in which his servants may work, and machinery in good repair, is discharged in such case, if there is no defect outside that which is pointed out for repair. It is like employment in tearing down a building, or performing other well known dangerous service, where the risks growing out of the work are assumed by the laborer by his contract to do the work. Boisvert v. Ward, 199 Mass. 594.
It was a part of the plaintiff’s contract of service to render to the engineer whatever aid he required, to report to him any trouble about the elevator, and it was a part of the engineer’s duty to repair the elevator. The plaintiff had as complete knowledge as anybody about the dangerous working of the elevator. There was no delay in undertaking to make the repairs. He knew that Wright was endeavoring to repair it and when his assistance to this end was asked, he voluntarily gave it. Under these circumstances a verdict should have been directed for the defendants. Kanz v. Page, 168 Mass. 217. O'Keefe v. John P. Squire Co. 188 Mass. 210. Reed v. Moore & McFerrin, 153 Fed. Rep. 358.
*327The assurance of safety by Wright just before the plaintiff went on top of the elevator was only the remark of one fellow servant to another, for which no liability attached to the defendants. Whittaker v. Bent, 167 Mass. 588. Kalleck v. Deering, 161 Mass. 469. Moody v.
The portion of the charge to which exception was taken, although a correct statement of the law as to res ipso loquitur in the abstract, was in large part inapplicable to the facts disclosed at the trial.
The case from the full statement of the evidence and the portions of the charge reported does not seem to have been tried along the lines we have indicated as the controlling legal principles, and therefore does not call for the application of St. 1909, c. 236, as to a direction for the entry of judgment in favor of the defendants. The rights of the parties can be better ascertained and protected by a new trial. The power conferred by this statute will ordinarily be exercised only when it is apparent that the real issues have been fully tried, or the merits of the case are plain.
Exceptions sustained.