154 Gr.-duc. Standardizing Institute for Glass Instruments, Ilmenau (Thur.). 



Glass Instrument Works: All Apparatus and Appliances for 

 Chemical, Physical and Commercial purposes, such as graduated goods 

 and volumetric appliances and apparatus for gas-analysis, mercury air- 

 pumps, apparatus for demonstration etc. etc. 



Incandescent Lamp Works: Only such lamps are made which 

 are used for demonstration or clinical, astronomical and optical pur- 

 poses, for the illumination of closed hollow bodies of any kind or for 

 decorative purposes. 



The Factory supplies its own gas and is provided with gas- 

 engine power. 



Exhibits : 



1. A Collection of Graduated Appliances. Graduated flasks 

 Avith auxiliary scale on the neck, fig. 1, for quickly and accurately 

 reading the pouring mark; graduated pipettes and full-pipettes (adjusted 

 to deliver one precise quantity), among these so-called poison-pipettes", 

 fig. la, provided with india-rubber collar and suction-tube ; a few burettes 

 and graduated flasks with certificates by the Standardizing Institute at 

 Ilmenau. 





Fig. 2b. 



Fig. 3. 



Fig. 4. 



2. Graduated Burette with 2 cocks and a flask containing the 

 liquid, fig. 2: Brink's, Mohr's, fig. 2a, and Gay-Lussac's burettes, 

 fig.2a, the latter with glass loop protecting the outlet jet from breaking off. 



