J. H. DALLMEYER 



(Son-in-Law akd Pupil of the late Andrew Boss), 



OPTICIAN, 



Respectfully bega to inform the Scientific Public, that in consequence of separating interests with T. Ross, he has 

 REMOVED the whole of the faculty for the production of the 



ASTRONOMICAL TELESCOPE 



(Bequeathed to him by the late A. R.), FROM No. 2, FEATHERSTONE BUILDINGS, TO 



No. 19, BLOOMSBURY STREET, OXFORD STREET, W.C, 



Where he continues to produce Instruments of the same high character as those supplied during A. R.'s lifetime, which 

 for upwards of six years have been exclusively made by him in this department, Theory and Practice haying been 

 successfully united, and hence the great Perfection of this important instrument. 



J. 5. D. being also in full possession of A. R.'s £ntib£ exferiekce in regard to the construction and manu- 

 facture of 



33^XOX1.0SOCDX>XO O:eJ£S0a?>-0-Xji..,A.SSE3S, 



Inheriting also one-half of the Implements, etc., used for the production of the latter, he is now prepared to supply 

 Object- Glasses of Improved Construction, the result of protracted analytic dioptric calculations. Particulars on 

 application. 



J. H. D. having also assisted the late A. R. in the constl-uctlon of his 



PHOTOGRAPHIC LENSES, 



Is intimately acquainted with the manner of their production, and now supplies these as well as all others.' 



OPTICAL INSTUHMENTS AND APPARATUS 



As manufactured and sold heretofore by his late Pather-in-Law. 



CATALOGUES MAY BE HAD ON APPLICATION TO 



No. Zd, BLOOMSBURY STREET, NEW OXFORD STREET, LONDON, W.C. 



