Rod' Section Cutting Apparatus. 71 



height, o feet 2 inches. Tlie table toji, which is 1^ inches 

 thick, is supported on a strong, well-braced framework, which 

 is screwed to the wall of the building so as to insure com- 

 plete freedom fi'oni vibration. The details of the construction 

 of the table may be readily made out from an inspection of 

 Plates XIV. and XVI., except that a supporting beam for the 

 three spindles, which runs from end to end of the table, 9 

 inches below its surface, cannot of course be seen. 



3. — Details of the Principal Mechanical Parts. 



These are described in order, from right to left, as they 

 appear in Plate XV. First comes the vertical revolving spindle 

 of the slicer. This is made of mild steel — as indeed are all 

 the spindles — 15 inches long, by 1^ inches in diameter. It 

 passes through an accurately bored, flanged collar 3 inches 

 long, screwed to the surface of the table.. The lower end of 

 this spindle, as also those of the grinding lap, is coned and 

 fits into a corresponding metal socket, provided with an oil 

 recess and protecting collar, which is screwed to the longitudinal 

 beam of the table frame. The top of the spindle is threaded 

 and carries carefully fitted collars and tianges for clamping the 

 slitting discs. 



Somewhat to the right of and behind the spindle of the 

 slicer, is a rod of steel 1 inch in diameter and 18 inches long. 

 The lower part of this rod, which is of somewhat greater dia- 

 meter than the upper part, is coarsely threaded for 6 inches 

 of its length, and screws into a long nut or socket fitted to 

 the table, thus forming an adjustable support for the various 

 specimen clamps. The rod has 3 inches or more of motion 

 by means of a screw, and a further range is obtained with the 

 aid of lock nuts sliding on the spindle itself. 



The larger specimen holder is of the usual parallel screw 

 clamp type, and will hold specimens up to 5 inches in dia- 

 meter. Several interchangeal)le clamps are used ; one of these, 

 to be seen in the photograph (Plate XV.) is adapted to hold 

 thick pieces of plate glass 3^ x 1^ inches (length and breadth) 

 to which the ordinary microslips are attached. In addition 



