POWELL & LEALAND, 



©pticiana 



New Yi^n. Apochromatic Homogeneous Immersion 



1.40 N. A. 



Price £10, with Correction Collar, 30s. extra. 



THIS OBJECTIVE IS A RAPID PHOTOORAPHER. 



NEW DRY APOCHROMATIC CONDENSER 



Corrected for thickness of Slip, can be adapted to the Ordinary Mount. 

 This Condenser is the best for Photo-Micrography, and the only Perfectly Corrected 

 one made. Numerical Aperture 'qS. Price, without Mount, £6. 



170 EUSTON ROAD, LONDON, N.W. 



CATALOaUES FREE ON APPLICATION. 



BEARD'S REGULATORS 



Are the most efficient and perfect for 

 controlHng compressed gasses. 



The best light is produced by using them. 



By having the Gauge attached to the 

 Regulator, the Quantity of Gas in Cylinder 

 can be Seen during Use. 



PRICES. 



Regulator 30s. 



Regulator, with Branch for Gauge, as 



Illustration SSn. 



Pressure Gauge 30s. 



BEARD'S ECLIPSE SLIDE CARRIER. 



Price lOs. 6d. 



PERFECT FOR SINGLE LANTERN DISSOLVING. 



The Easiest and Simplest Carrier for showing sHdes in a 

 Single Lantern. Only one movement to produce the change, 

 which is similar to dissolving. All the Slides are put in and 

 taken out from one end. The Best Carrier extant. 



IMPROVED HIGH-POWER 

 MIXED JET. 



HARD LIMES. 



SPECIAL DURABILITY BRILLIANCY 

 UNSURPASSED. 

 Price 2s, 6(7, per Dozen. 



A MARVELLOUS LIGHT FOR 

 CINEMATOGRAPH. 



RD RPADn INVENTOR, MANUFACTURER, 



. IV. DCAIVU, ,0 Trafalgar Road, Old Kent Road, LONDON. 



