144 Voigtlaender & Sohn. Braunschweig. 



This addition, to their former series, of wide angle lenses with flat and 

 anastigmatic field fills the last gap which had been felt. 



The entire list of objectives of various classes made by the firm 

 forms a most complete selection of lenses for all purposes and satisfies all 

 the wants of professional, amateur and scientific photographers. 



In the 137 years of its existence the firm has steadily grown and 

 always kept pace with the requirements of the time by utilising improved 

 methods and einploj'ing the best modern machinery. The works in Brunswick 

 include new extensive buildings provided with high and spacious work- 

 shops electrically illuminated by own machines and accumulators. The 

 firm employs now about 100 men. A hall of 120 square meters area 

 has been reserved for examining and testing binoculars and telescope?, 

 and a studio having an area of 100 square meters has been set apart 

 for testing photographic lenses. The conditions of illuminations are so 

 favourable in these spaces as to render experiments therein independent 

 of the differences of light. 



The lenses are ground by machinery, whilst the polishing, which 

 is controled by standard lenses, is mainly effected by hand, in order to 

 avoid the detrimental effects of heating to which large lenses are exposed, 

 if polished by machinery, and also to obtain the means of individual 

 correction. - A speciality of the works consists in their Ramollir or 

 remoulding plant, in which they press or mould their own lenses. This 

 plant consists of a double totally independant set, thus warranting to 

 carry on the work without interruption. Each plant consists of a preli- 

 minary heating and annealing oven and the pressing oven. Being 

 thus independant of other glass works the firm is in a position to effect 

 any order without loss of time. 



The U. S. A. Agents of the firm are: 



For Photographic lenses: Messrs. Benjamin French & Co. 



319 Washington Street, Boston. 



For Binoculars and Hand-telescopes: Messrs. Tiffany & Co. 



Union Square, New- York. 



