PROCESS FOR PRESERVING PEARL-OYSTER FISHERIES. 311 
are being taken. The conveyer belt should be sufficiently long to allow the 
developed radiograph to be secured and examined with the corfesponding orig- 
inal objects without disturbing the continuity of action of the machine. Each 
radiograph will have printed upon it the distinguishing character of that portion 
of the conveyer, and the different objects may be identified before they are 
disturbed. 
A further modification of the invention may be made by utilizing the 
principles of the fluoroscope. In this form, in place of the sensitized medium 
would be used the ordinary fluoroscope screen, formed of any suitable mate- 
rial, as, for instance, the tungstate of barium or of strenium, in crystallized 
form, or barium platinum cyanide. The conveyer carrying the objects should 
in this case be placed between the X-ray tube and the fluorescent screen. 
Having now particularly described and explained the nature of my inven- 
tion, and in what manner the same is to be operated, I make the following 
claims therefor: 
(1) The herein described process of examining separated matter or different 
objects, such as pearl oysters, in quantities, which consists in placing them upon 
a suitable support of a character that will not obstruct or only slightly obstruct 
the passage of X rays, Rontgen rays, or any other rays penetrating matter 
opaque to light; placing the sensitized medium below the support and exposing 
the objects and medium to the action of the rays; removing the support without 
disturbing the positions of the objects and then developing the sensitized 
medium, whereby a radiograph of the objects will be obtained, which can be 
compared with the objects without disturbing them. 
(2) In an apparatus for examining matters or objects in bulk, the com- 
bination with a support for the objects, the said support being formed of mate- 
rial readily penetrable by the rays, and having upon it a distinguishing mark, 
made of material not penetrable, in combination with a means for producing rays. 
(3) An improved tray, made of material which is of such quality and 
dimensions as will permit objects to be placed thereon and readily radiographed 
as though such tray had not been interposed between such objects and the 
sensitized medium. 
(4) The combination with a tray of canvas (c) and a rigid frame (a) to 
which the canvas is stretched. 
(5) The combination with the bottom and frame of a tray and a second 
frame above the bottom, the said second frame being for the purpose of keep- 
ing the matter which is examined a sufficient distance away from the first frame, 
in order that the rays passing through such matter will fall clear of the first 
frame and upon the sensitized medium. 
(6) The combination with a conveyer and a frame of means for support- 
ing the sensitized medium below the conveyer, and means for producing rays 
and securing a radiograph upon the sensitized medium. 
