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72 hall's illustrated catalogue of It is so arranged that by slipping out the tube-holder, taking out the tube and putting it into the vertical board, and slipping the board into the place of tube-holder, the Lantern is ready for use. It can be used with either the oil lamp, or oxy-calsium, or oxy-hydrogen burners. No. 38. Educational Lantern, with If hi. tube and oil lamp, $43.00 No. 39. •• " •• 2{j 50.00 No. 40. •■ •• " -» Calsium Lamp, 30x40 gas bag. Retort wash-bottle, Lamp and Stand -SO.00 No. 41. Educational Lantern, with oxy-hydrogen Blowpipe. 65.00 No. 42. The Vertical Attachment for Educational Lantern, 15.00 The price of No. 42 includes splitting the condenser and fitting the attachment to the lantern. Flat Test Tubes, of thin glass, for projecting chemical reactions : 4x£xl-16, per doz $0.60 5xfx£ 80 6xfx£ ,. 1.25 The size of Pictures obtained with the different Tubes and Lights are nearly as follows : At 10 to 15 feet distance. Oil Lamp, with If in. tube, will make pic- ture 6 to 9 feet. At 20 feet distance, the Calsium Burner, with If in. tube, will make picture about 12 feet. At 30 feet distance, the Oxy-Hydrogen Burner, with 2| in. tube, will make picture about 10 feet. At 50 feet distance, the Oxy-Hydrogen Burner, with 2| in. tube, will make picture about 16 feet. At 60 feet distauce, the Oxy-Hydrogen Burner, with 3| in. tube, will make picture about 15 feet. At 150 feet distance, the Oxy-Hydrogen Burner, with 3^ in. tube, will make picture about 25 feet. From the above table may be ascertained the size of tube and light required to obtain the picture desired. The relative illuminating power of the various lights, which has been determined by the Photometer, is given below in what is called caudle power. Illuminating gas 15 Coal Oil in Argand's Burner ....... 20