"That isn't glass, Carnes," said the doctor. "That plate is made of vitrilene, a new product which I have developed. It looks like glass, but it has entirely different properties. It is of enormous strength and is quite insensitive to shock. It has one most peculiar property. While ultra-violet and longer rays will penetrate it quite readily, it is a perfect screen for X-rays and other rays of shorter wave length. It appears to be the only piece of transparent substance in my laboratory which has not been fogged, as you call it."
"Do short waves fog glass, Doctor?"
"Not so far as I know at present, but you must remember that very little work has been done with the short wave-lengths. In the vast range of waves whose lengths lie between zero and that of the X-ray, only a few points have been investigated and definitely plotted. There may be in that range a wave-length which will fog glass."
"Then your theory is that some sort of a ray machine was put in operation before the helicopter landed?"
"It is too early to attempt any theorizing, Carnes. Let us confine ourselves to the known facts. Lieutenant Breslau was normal at midnight and was working in this room. Some time between then and seven this morning he underwent certain mental and physical changes which prevent him from telling us what he observed. During the same period, a hole was cut in the roof and things of great importance stolen. At the same time, all the glass in the laboratory became semi-opaque. The problem is to determine what connection there is between the three events. I will handle the scientific end here, but there is some outside work to be done, and that will be your share."
ive your orders, Doctor," said the detective briefly.
"To understand what I am driving at, I will have to tell you what has been stolen. Naturally this is highly confidential. Some rumors have leaked out as to my experiments with 'radite,' as I have named the new radium-containing disintegrating explosive on which I have been working, but no one short of the Secretary of War and the Chief of Ordnance and certain of their selected subordinates knows that my experiments have been successful and that the United States is in a position to manufacture radite in almost unlimited quantities from the pitchblende ore deposits of Wyoming and Nevada. The effects of radite will be catastrophic on the unfortunate victim on whom it is first used. The only thing left to do was to develop a gun from which radite shells could be fired with safety and precision.
"Ordinary propellant powders are too variable for this purpose, but I found that radite B, one form of my new explosive, can be used for propelling the shells from a gun. The ordinary gun will last only two or three rounds, due to the erosive action of the radite charge on the barrel, and ordinary ordnance is heavier and more cumbersome than is necessary. When this was found to be the case, the Chief of Ordnance detailed Lieutenant Breslau, the army's greatest expert on gun design, to work with me in an attempt to develop a suitable weapon. Breslau is a wizard at that sort of work and he has made a miniature working model of a gun with a vitrilene-lined barrel which is capable of being fired with a miniature shell. The gun will stand up under the repeated firing of radite charges and is very light and compact and gives an accuracy of fire control heretofore deemed impossible. From this he planned to construct a larger weapon which would fire a shell containing an explosive charge of two and one-half ounces of radite at a rate of fire of two hundred shots per minute. The destructive effect of each shell will be greater than that of the ordinary high-explosive shell fired from a sixteen-inch mortar, and all of the shells can be landed inside a two-hundred foot circle at a range of fifteen miles. The weight of the completed gun will be less than half a ton, exclusive of the firing platform. It is Breslau's working model which has been stolen."