360 



NEGRETTI AND ZAMBEA, HOLBORN VIADUCT, E.G., 



FIG. 1771. 



NEGRETTI AND ZAMBRA'S IMPROVED BI-UNIAL OXY-HYDROGEN 

 LIME LIGHT DISSOLVING VIEW APPARATUS. 



1771 Mahogany Lantern Lined with Tin (as fig. 1771), having 3| inch Condensing 



Lenses, Brass Mounts to Front Lenses with Rackwork Adjustments, 

 Japanned Tin Sliding Front to vary distance between Lantern and Screen. 

 Complete with Apparatus for making and purifying the Gas. Full size 

 Gas Bags and Pressure Boards. Flexible conducting Tubes and Con- 

 nectors, &c., &c. To give a brilliant Disc of 12 to 16 feet in diameter 

 from Paintings 3i inch diameter . . . . . . 27 



1772 Ditto ditto as above, but with 4-inch Condensing Lenses for producing a 



Disc of 16 to 20 feet diameter 31 10 



Handsome Brass Fronts to either of the above Sets with Extra Lenses and 

 mountings for projecting a smaller picture at great distance. 



each extra 300 



The arrangement of Lanterns (as fig. 1771) can only be effectively used with 

 the.Oxy-Hydrogen Lime Light, the vapour or smoke given off in the lower Lantern 

 injuriously affecting the Light in the upper one. 



