NOTES AND BIEMORANDA. 



467 



the frame is the brass pan E. Near the centre of this pan is a well, 

 1 inch in diameter and 2 inches deep. At one side of the well is a 

 clamp, 4, which by the screw 1 is pressed tightly against the speci- 

 men to be cut. Over this pan is the iron tripod T T (see Fig. 2), beneath 

 which is suspended a brass plate A by means of the bolts 8 and 9. 



Fig. 1. 



This plate is made to incline more or less towards the glass plate C, 

 and is fastened firmly in position by the set screws 11 and 12. By 

 these any desired inclination can be given to the cutting blade, which 

 is clamped to the under surface of the plate A. He commonly used 

 a wide Le Coulter razor blade for cutting. The legs of the tripod have 

 ivory pins driven firmly into holes drilled deep in their ends ; these 



Fig 2. 



pins project one-fourth of an inch, and their points, 3, 4, 5, rest on the 

 glass plates C and D. From the sides of two of the legs ivory pins 

 l^roject in the same way, and their points, 1 and 2, rest against the 

 glass B. The oj^posite sides of the well are grooved on their outer 

 surfaces, and in these grooves rest brass guide-pieces, which are 

 firmly bolted to the frame X X, and connected with these guide- 

 pieces is a screw, the point of which presses against the lower part 



2 11 2 



