414 SUMMARY OF CURRENT RESEARCHES RELATING TO 



•11 1 1 1 ^i^ TTik Rorew works iu a clamp whicli can be 

 tLe clamp, and with it tiie stage, to reTOlve. Wl.cn tiie clamp 



Fig. 60. 



1 .!,„ „t«,.? can lie revolved by the liand. This mcolianism 

 'ffecW fte kw Jato^y motion of the stage is similar to that 

 gfreralfy wKed in the construction of theodohtes and alt-azrmuth 

 instruments. ^ 



