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This I have seen more than once. They sometimes venture on larger game than the small gnats. I don't remember to have ever before met with them so strong and tenacious, and the makers of optical instruments might there have found abundance of threads which I am told are valuable as cross-wires for transit- instruments and theodolites.
These telescopes were all made with a convex object-glass and a concave eye-lens, and this type is spoken of as the Galilean telescope. Its defects are that it has no real focus where cross-wires can be placed, and that the field of view is very small. Kepler suggested the convex eye-lens in 1611, and Scheiner claimed to have used one in 1617. But it was Huyghens who really introduced them.
The image of the sun was projected upon a screen by means of a firmly-clamped telescope, in the focus of which were placed two cross-wires forming angles of 45° with the meridian. The six instants were then carefully noted at which these were met by the edges of the disc as it traversed the screen, and by the nucleus of the spot to be measured.
A backward glance told me that the fire was nearing the tail-plane at the one end and my box of ammunition at the other, and was too serious for treatment by the extinguisher unless I could get it at once. Desperately I tried to force myself through the bracing-struts and cross-wires behind my seat.
By the time the engineer got the water worked out of his cylinders, the trolley was creeping up beside his tank. He saw the flash from the wire above as the car, nodding and dipping like a light boat in the wake of a ferry, shot beneath the cross-wires, and knew instantly that she was after him.
Here and there a blaze of light from a store window invited belated passers to covet the bargains offered within; a half-dozen incandescent bulbs, swung on cross-wires at intervals along the street, glowed feebly as if weary with the effort to beat back the darkness clutching at the throat of the town; over the sidewalk in front of the Elite Amusement Parlor an illuminated red and green sign told that Mike Sabota's place was still open; across the porch of the Occidental Hotel and spilling itself on the ground out in the street a stream of light guided weary travelers to the portals of that ancient, though hospitable, institution; from the sides of the Butte beyond the railroad tracks a coyote yelped shrilly a jerky, wailing challenge a dozen dogs, suddenly aroused in different parts of the town, answered.
When within fifty yards of the surface, all four men made a search for cross-wires below. They saw none; there were no poles, even. Neither, to their astonishment, was there such a thing as a sidewalk. The street stretched, unbroken by curbing, from wall to wall and from corner to corner. As the cube settled slowly to the ground, the adventurers left the deadlight to use the windows.
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