548 SEC. 13. CHEMISTRY. 



VII. MISCELLANEOUS. 



2530. Phosphorus Eudiometer. 



University of Munich, Professor von Jolly. 



2531. Photograph of a Wild's Folaristrobometer, for 



determining the rotation at different temperatures. The tube 

 containing the liquid is surrounded by a jacket, through which 

 water of a given temperature flows. The apparatus is manu- 

 factured by Messrs. Hermann and Pfister, Bonn. 



Professor H. Landolt, Aix-la- Chapelle. 



2532. Photographs of a simple Folaristrobometer with 

 two Nicol's prisms, constructed for holding tubes, one meter in 

 length, containing the liquids which can be placed in a water-bath ; 

 and a blow-pipe lamp, over which is suspended a platinum gauze 

 cage for holding the sodium salt which is used for producing the 

 monochromatic sodium flame. 



Professor H. Landolt, Aix-la- Chapelle. 



The lamp is manufactured by Dr. Meyerstein of Gottingen, and by Feld- 

 hausen, philosophical instrument maker, Aix-la-Chapelle. 



2533. Photograph of the same apparatus, provided with a 

 short tube for holding the liquid. A bottle containing a solution 

 of potassium dichromate is interposed between the tube and the 

 sodium flame, to ensure a purer, monochromatic light. 



Professor If. Landolt, Aix-la- Chapelle. 



2534. Apparatus for boiling off the air from sea-water. 



Professor Oscar Jacobsen, Rostock. 



2534a. Azotometer arranged for the easy and exact determi- 

 nation of the nitrogen contained in the manures employed in 

 agriculture. M. Honzeau, Paris. 



2547a. Fairley's simple form of Ozone Generator in 

 Glass. Harvey, Reynolds, and Co. 



2548. Smyth's Ozone ometer, for the observation of atmos- 

 pheric ozone by means of an aspirator. John Smyth. 



This consists of two hard wood tuhes or boxes, about two inches long and 

 two inches in external diameter ; the inner one is so much less than the outer 

 as to fit tightly into it. It is also about one-eighth of an inch shorter, and its 

 extremity at the open end is grooved for an india-rubber band, which holds 

 the test paper stretched across its mouth. The entrance tube for the air, a 



