^10 



leave iJiroiigli the ineimi-y ar the wire sealed in liigher. When We 

 provide ilie side-tube with a scale, and till everything with inercnrj, 

 and place it in a waterbath, a very accnrate gauging is again 

 jx)ssible as described in Conim. 5 p. 7H6. We llrst gauge the dis- 

 tances of the etched lines, then the volume from these lines to the 

 sealed in wire, and then from there to the elched scalar division, 

 and this division itself. 



Fig 13. 



Tlie large reservoii*, which is to be sealed to this top piece is 

 calibrated after this sealing, by tilling with mercury the volume 

 from the scalar division on the top piece to the scalar division at 

 the bottom on the bottom piece. 



We now know sufficiently accurately the volume from the etched 

 lines to the sealed in wire, and from here to the scalar division 

 under the large reservoir. The tube is now fused to at the upmost 



