[May, 1902.] 



THE 



SCIENTIFIC TKMSACTIONS 



ROYAL DUBLIN SOCIETY. 



VOLUME VIL— (SERIES II.) 



XV. 

 SOME NEW FORMS OF GEODETICAL INSTRUMENTS. 



BY 



SIR HOWARD GRUBB, F.R.S., 

 Vice-Pres. Royal Dublin Society. 



(Plate XXXIV.) 



DUBLIN: 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 



WILLIAMS AND NOEGATE, 



14, HENRIETTA STREET, COVENT GARDEN, LONDON ; 



20, SOUTH FREDERICK STREET, EDINBURGH; and 7, BROAD STREET, OXFORD. 



PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND WELDRICK. 



1902. 



Price One Shilling. 



