Opinion by

This was an action by an employee against his employer to recover damages for personal injuries received during his employment. The court below directed a compulsory nonsuit, which it subsequently refused to take off. The facts shown by the testimony are as follows: Plaintiff, a carpenter, was employed by defendant, a contractor and builder, who had a contract for the alteration of a building occupied by the Lancaster Trust Company in the City of Lancaster. In the course of his employment plaintiff was directed by the foreman to make certain alterations in a window frame, the bottoin of which was about thirty feet above the floor, and the top some fifteen feet higher. To comply with the directions of the foreman plaintiff secured the tools necessary to be used in the work, and, carrying them in one hand and using the other for support, proceeded to ascend the ladder leading to the window. Upon reaching a point about thirty-five feet above the floor, one of the rungs of the ladder gave way, causing him to fall to the floor below and receive the injuries for which this action to recover compensation was brought. The ladder consisted of three sections made by other employees engaged on the building, the first two being each sixteen feet in *378length, made of uprights of three by four material with strips of board one inch by two inches for rounds nailed to the uprights at intervals of ten inches. The third or upper section, the one from which plaintiff fell, was an 'old ladder previously used by other workmen employed around the building and was procured by plaintiff from a pile of material in the building and spliced to the other two sections by himself and three fellow workmen with pieces of material also found in the building, and so far as appears from the evidence each section was properly constructed and the ladder as a whole appeared to be substantial and safe. There is no evidence to show when the rung that caused plaintiff’s fall became loose and in an unsafe condition. The ladder had been used in safety by plaintiff the day previous to the accident and by other employees immediately before plaintiff fell. Neither is there evidence of a complaint on the part of employees that the ladder was in a dangerous or insecure condition, nor evidence to indicate defendant had either actual or constructive notice of any defect in either the material used in its construction or the manner in which it was constructed. Under these circumstances there was no proof of negligence on the part of defendant and the action of the court below in entering a nonsuit was proper.

It is undoubtedly the rule that a master is bound to furnish his servant with a reasonably safe place in which to work and also with proper tools and appliances. This duty is an absolute one from which nothing but performance can relieve him and a person to whom the duty may be delegated becomes a vice-principal whose negligence is that of the employer. Biit where an employee" institutes proceedings for damages based on negligence upon the part of his employer, it is not sufficient to entitle him to recover merely to prove the fact of the accident and consequent injury. There must be affirmative proof of a negligent act either of omission or commission on the part of the employer, which was the cause of the accident. Where the alleged negligence is due to *379defects in tools, machinery or appliances, used in the course of the employment, plaintiff does not meet the burden cast upon him of establishing negligence upon the part of his employer merely by shewing an existing imperfection at the moment of the accident. It must be shown further that the master was aware of the flaw or would have known of it if reasonable and proper inspection had been made. Where a defect arises in the course of the use of tools or appliances the master is not responsible for such defect in absence of proof of sufficient time and opportunity to discover the flaw. Such incidental dangers arising during the course of employment are risks which the servant takes upon himself. He has better means of observing the imperfection, than has the master and it is his duty to use proper care to discover them, and when discovered report them to his employer: Baker v. Allegheny Valley R. R., 95 Pa. 211; Mixter v. Imperial Coal Co., 152 Pa. 395; Ehni v. National Tube Works Co., 203 Pa. 186.

The judgment of the court below is affirmed.