Passage: For hundreds of years, abdominal gunshot wounds had meant death by gangrene or other infection, with doctors able to do little more than ease pain.  Only seventeen years previously, Dr. Emil Kocher, a Swiss surgeon, had been the first to successfully operate on a patient who had received such a wound. To increase the lighting, sunlight was reflected onto the wound by another physician; towards the end of the surgery, a better light was rigged. The hospital lacked basic surgical equipment such as retractors. With McKinley in a weakened condition, Mann could do little probing of the wound to try to find the bullet; his work was complicated by the fact that the President was obese.  The surgeon made an incision in the President's skin, and found and removed a small piece of cloth which was embedded in the flesh.  He probed with his finger and hand, finding damage to the digestive system—the stomach displayed both an entry and exit wound.  Mann sewed up both holes in the organ, but could not find the bullet itself; he concluded it had lodged in the President's back muscles.  He later wrote, "A bullet once it ceases to move does little harm."  A primitive X-ray machine was on display at the fair but was not used on McKinley; Mann later stated that its use might have disturbed the patient and done little good.  He used black silk thread to stitch the incision and wound, without drainage, and covered the area with a bandage.  As the operation concluded, Dr. Park arrived from Niagara Falls; he was unwilling to interfere and at 5:20, McKinley was given another shot of painkiller and allowed to awaken.  He was taken to the Milburn House by the electric ambulance.  The First Lady had not been told of the President's shooting; once the surgery was complete, the presidential physician, Presley M. Rixey, gently told her what had occurred.  Ida McKinley took the news calmly; she wrote in her diary, "Went to Niagra  [sic] Falls this morning.  My Dearest was receiving in a public hall on our return, when he was shot by a ......

Question: What is an example of equipment the hospital did not have?
retractors