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Number four elevator was acting up again. Cy Lewin, its elderly daytime operator, was getting thoroughly sick of number four and its capriciousness, which had started a week or more ago and seemed to be getting worse.

Last Sunday the elevator had several times refused to respond to its controls, even though both cage and landing doors were fully closed. The relief man had told Cy that the same thing happened Monday night when Mr. McDermott, the assistant general manager, was in the car.

Then, on Wednesday, there had been trouble which put number four out of service for several hours. Malfunctioning of the clutch arrangement, engineering said, whatever that meant; but the repair job had not prevented another hiatus the following day when on three separate occasions number four refused to start away from the fifteenth floor.

Now, today, number four was starting and stopping jerkily at every floor.

It was not Cy Lewin's business to know what was wrong. Nor did he especially care, even though he had heard the chief engineer, Doc Vickery, grumbling about "patching and patching" and complaining that he needed "a hundred thousand dollars to rip the elevators' guts out and begin again."

Well, who wouldn't like that kind of money? Cy Lewin himself sure would, which was why every year he scraped together the price of a sweepstake ticket, though a fat lot of good it had ever done him.

But a St. Gregory veteran like himself was entitled to consideration, and tomorrow he would ask to be moved over to one of the other cars. Why not?

He had worked twenty-seven years in the hotel and was running elevators before some of the young whippersnappers now around the place were born.

After today, let someone else put up with number four and its contrariness.

It was a little before ten a.m., and the hotel was becoming busy. Cy Lewin took a load up from the lobby, mostly conventioneers with names on their lapels - stopping at intermediate floors until the fifteenth, which was the top of the hotel. Going down, the car was filled to capacity by the time he reached the ninth, and he highballed the rest of the way to the main lobby. On this latest trip he noticed that the jerkiness had stopped. Well, whatever that trouble was, he guessed it had fixed itself.

He could not have been more wrong.

High above Cy Lewin, perched like an eyrie on the hotel roof, was the elevator control room. There, in the mechanical heart of number four elevator, a small electrical relay had reached the limit of its useful life. The cause, unknown and unsuspected, was a tiny push rod the size of a household nail.

The push rod was screwed into a miniature piston head which, in turn, actuated a trio of switches. One switch applied and released the elevator brake, a second supplied power to an operating motor; the third controlled a generator circuit. With all three functioning, the elevator car moved smoothly up and down in response to its controls. But with only two switches working - and if the nonworking switch should be that which controlled the elevator motor - the car would be free to fall under its own weight. Only one thing could cause such a failure - the over-all lengthening of the push rod and piston.

For several weeks the push rod had been working loose. With movements so infinitesimal that a hundred might equal the thickness of a human hair, the piston head had turned, slowly but inexorably unscrewing itself from the push rod thread. The effect was twofold. The push rod and piston had increased their total length. And the motor switch was barely functioning.

Just as a final grain of sand will tip a scale, so, at this moment, the slightest further twisting of the piston would isolate the motor switch entirely.

The defect had been the cause of number four's erratic functioning which Cy Lewin and others had observed. A maintenance crew had tried to trace the trouble, but had not succeeded. They could hardly be blamed. There were more than sixty relays to a single elevator, and twenty elevators in the entire hotel.

Nor had anyone observed that two safety devices on the elevator car were partially defective.

At ten past ten on Friday morning, number four elevator was - in fact, and figuratively - hanging by a thread.

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