and Laboratory Methods. 



1(J5^ 



The solid portions of the table are padded with a sheet of felt slightly thicker 

 than an X-ray plate included in its envelopes. Beneath the table, and corre- 

 sponding accurately in size and situation to the openings above described, are 

 three wooden plate carriers, which slide vertically in suitable guides. Each 

 carrier is raised and lowered by means of strong wooden supports beneath the 

 table arranged in the form of a toggle-joint. When the elbow of the joint is 

 straightened the plate carriers are raised and pressed firmly upward against the 

 pegamoid covering of the table. When bent, the plate carriers descend and 

 permit the introduction or removal of the photographic plates, a suitable space 

 being provided for this purpose at one side of the table. The position of the 

 plates upon the carriers is accurately fixed by means of wooden kits of different 

 sizes. 



Fig. 1.— An X-Ray Table. 



The lower limbs of the toggle-joints are pivoted beneath upon a heavy iron bar 

 which extends the whole length of the table. The weight of the patient's body 

 over-lying the carriers is thus firmly supported. Upon the pegamoid surface of 

 the table the position of the dififerent sized plates is clearly marked by shallow 

 grooves in the cloth, corresponding to the situation of the underlying plates. 

 The part to be pictured may thus be arranged upon the surface of the table with 

 reference to the underlying plates without difficulty. Along either border of the 

 table, and below the level of its upper surface, three pairs of metal knobs or 

 buttons are affixed opposite to each opening. To these buttons thin leather 

 straps are fastened; they may be buckled across the part to be pictured, thus 

 securing complete immobility during the exposure. 



The device which holds the tube, and permits it to be moved a measured 

 distance horizontally or vertically, is constructed as follows : 



