96 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



or lowers the body « Ju? is effected by a coned pin of steel, a steel roller 

 being kept in contact with the cone by a reactionary spring. The body- 

 tube is 145 mm. long, and by extension of the draw-tube is 225 mm. 



Fig. 8. 



The stage, 3J in. scpiare, is covered with ebonite and fitted with grip 

 stage springs. The instrument is adapted for either comround, 

 rackwork substage, or spiral focusing substage. 



