378 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



combining tlie powers of three lanterns in one, with 

 only one lamp. With the oxygen lamp a disk of twenty 

 feet may be obtained for each tube, and each disc capable 

 of being- darkened to any required extent, without the 

 least shadow on any particular portion of the picture. 

 The three discs, by means of prisms, may be thrown, 

 either altogether on one circle, or united, at various dis- 

 tances in length, on the screen, to form one panoramic 

 picture. All the various effects that can be produced by 

 the employment of two or three distinct lanterns, of the 

 usual form, each requiring a light, are obtained far more 

 effectively, and with much more facility, by the trinoptric 

 lantern, which, exclusive of always securing uniform illu- 

 mination, from the superiority in the optical arrangement 

 of the apparatus, each picture is perfectly flat, and well 

 defined to the extreme edge. The lamp is on the foun- 

 tain principle, with a small circular wick ; a small tube 

 passes through the centre of the wick, for the purpose of 

 supplying a stream of oxygen gas, by which an intense 

 light is produced, nearly equal in illuminating power to 

 the oxy-hydrogen. 



Price, with condensing lenses 3j inches diameter, with 

 gas-bag and apparatus complete for producing the gas, 



$150,00. 



Also, the same apparatus with a solar lamp in place of 

 the oxygen lamp and gas apparatus, by which a disc of 

 eight or ten feet, or more, may be obtained, much superior 

 to the usual dissolving lanterns. Price $135.00. 



The Prismatic Binoptric Lantern, for Oxy-Hi/drogcn 

 or Lime-Light. (Fig. 796.) The prismatic binoptric 

 lantern is adapted for the oxy-hydrogen, or lime-light, 

 condensing lenses 3-| inches diameter, and is the most 

 complete and effective instrument yet manufactured, capa- 

 ble of giving one or two brilliant discs to any extent re- 

 quired, with dissolving effects the most perfect produced 

 by one lantern and one jet : thus combining excellence in 

 optical and mechanical arrangements. Apparatus, con- 

 sisting of the most improved oxy-hydrogen jet and lime- 

 holder, with clockwork motion, two large gas-bags, with 

 stop-cocks, flexible tubes, pressure-boards, hydrogen gen- 

 erator and purifier, iron retort for oxygen, &c. 



Price $265.00. 



