"A nice racket," Jason said, looking at the sealed covering on the engines. "Why don't you just crack into them and fix them yourself, they can't be very complex."
"That is death!" Edipon gasped, and both D'zertanoj recoiled from the boxes at the thought. "We have tried that, in my father's father's day, since we are not superstitious like the slaves and know that these are man-made not god-made. However the tricky serpents of Appsala hide their secrets with immense cunning. If any attempt is made to break the covering horrible death leaks out and fills the air. Men who breathe the air die, and even those who are solely touched by it develop immense blisters and die in pain. The man of Appsala laughed when this happened to our people and after that raised the price even higher."
Jason circled one of the boxes, examining it with interest, trailing Narsisi behind him at the end of the chain. The thing was higher than his head and almost twice as long. A heavy shaft emerged through openings on opposite sides, probably the power takeoff for the wheels. Through an opening in the side he could see inset handles and two small colored disks, and above this were three funnel-shaped openings shaped and painted like mouths. By standing on tiptoe Jason looked on top but there was only a flanged, sooty opening that must be for attachment of a smokestack. There was only one more opening, a smallish one in the rear, and no other controls on the garish container.
"I'm beginning to get the picture, but you will have to tell me how you work the controls."
"Death before that," Narsisi shouted. "Only my family—"
"Will you shut up!" Jason shouted right back. "Remember? You're not allowed to browbeat the help anymore. There are no secrets here. Not only that, but I probably know more about this thing than you do just by looking at it. Oil, water and fuel go in these three openings, you poke a light in somewhere, probably in that smoky hole under the controls, open one of those valves for fuel supply, another one is to make the engine go slower and faster, and the third is for your water feed. The disks are indicators of some kind." Narsisi paled and stepped back. "So keep the trap shut while I talk to your dad."
"It is as you say," Edipon pointed. "The mouths must always be filled and woebetide if they shall go empty for the powers will halt or worse. Fire goes in here as you guessed, and when the green finger comes forward this lever may be turned for motion. The next is for great speed or going slow. The very last is under the sign of the red finger, which when it points indicates need, and the handle must be turned and held until the finger retires. White breath comes from the opening in back. That is all there is."
"About what I expected," Jason muttered and examined the container wall, rapping it with his knuckles until it boomed. "They give you the minimum of controls to run the thing, so you won't learn anything about the basic principles involved. Without the theory you would never know what the handles control, or that the green indicator comes out when you have operating pressure or the red one when the water level is low in the boiler. Very neat. And the whole thing sealed up in a can and booby-trapped in case you have any ideas of going into business for yourself.
"The cover sounds like it is double walled, and from your description I would say that it has one of the vesicant war gases, like mustard gas, sealed inside there in liquid form. Anyone who tries to cut their way in will quickly forget their ambitions after a dose of that. Yet there must be a way to get inside the case and service the engine, they aren't just going to throw them away after a few months' use. And considering the level of technology displayed by this monstrosity I should be able to find the tricks and get around any other built-in traps. I think I'll take the job."
"Very well, begin."