Bauhaus-Universität Weimar

Schott & Genossen. 
135 
4. Grain Tester, system of the Kaiserl. Normal-Eichungs- 
Kommission, stationary form, capacity 1/4 liter. (Fig. 4.) 
5. Grain Tester, portable form, capacity Y4 liter. (Fig. 5.) 
packed in case. 
Fig. 5. 
ready for use. 
Schott & Genossen 
Jena. 
Glass Works. 
No. 1—9 in B. 
Glass for Scientific and Industrial Purposes. 
Apart from the ordinary crown and flint glasses, the regular 
manufacture includes a series of new glasses, such as borate and 
baryta, crown and flint glasses, which are extensively used by all 
leading manufacturing opticians and have furnished the means for 
many improvements in the construction of optical instruments. 
We may mention among these: Improved achromatic microscope 
objectives, apochromatic microscope lenses, anastigmatic lenses for 
photographic objectives, telescope lenses without secondary spec¬ 
trum, new Zeiss prism binoculars (with the aid of colourless prism 
glass). Recently, to the foregoing has been added the manufacture
        

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