A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



BROW NING'S BINOCU LARS. 



THE NEW THREE-POWER GLASS, 



VERY POWERFUL. 



By turning a stud, the eye-pieces are made changeable 

 at pleasure, so that the glass becomes suitable for either 

 theatre, field, or marine purposes. The arrangement is so 

 strong and simple that it cannot get out of order, nor can 

 the eye-pieces be lost. 



PRICE PROM £4 4s. 



THE DICRATIC, 



OR DOUBLE-POWER BINOCULAR, 



WITH TWO DRAWERS. 



This Binocular Glass having two drawers, the power is nearly double. 

 This glass is specially adapted for use at sea, or to make out distant 

 signals. It is also better adapted than most Binoculars for looking for 

 shot-marks on targets. It is specially adapte.l for any purpose for which 

 high magnifying power alone is suitable. 



Price, with 12 Lenses, Object-Glasses 2 in. in diameter, 



£6 10s. 



ACHROMATIC OPERA GLASS IN CASE, FROM 10s. 6d. 

 Complete Illustrated Catalogue of Prices free. 



JOHN BROWNING, 



OPTICAL AND PHYSICAL INSTRUMENT MAKER TO HER MAJESTY'S GOVERNMENT, THE ROYAL 



OBSERVATORY OF GREENWICH, &c., &c. 



6 3, STRAND, W.C, 



PRIZE Mi: DAL, 1862. 



LONDON. 



ESTABLISHED 100 YEARS. 



