Page:The warlord of Mars.djvu/66

  in the door. I could have cried aloud in exultation when my scrutiny disclosed the almost invisible incrustation of particles of carbonized electrons which are thrown off by these Martian torches.

It was evident that for countless ages radium torches had been applied to this pinhole, and for what purpose there could be but a single answer—the mechanism of the lock was actuated by light rays; and I, John Carter, Prince of Helium, held the combination in my hand—scratched by the hand of my enemy upon his own torch case.

In a cylindrical bracelet of gold about my wrist was my Barsoomian chronometer—a delicate instrument that records the tals and xats and zodes of Martian time, presenting them to view beneath a strong crystal much after the manner of an earthly odometer.

Timing my operations carefully, I held the torch to the small aperture in the door, regulating the intensity of the light by means of the thumb-lever upon the side of the case.

For fifty tals I let three units of light shine full in the pinhole, then one unit for one xat, and for twenty-five tals nine units. Those last [ 54 ]