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



Nr. 2804. 



Grand-Ducal Standardizing Institute for Glass 

 Instruments, Ilmenau (Thuringia). 



This Institute was founded in 1889 by the Government of the 

 Grand-dukedom of Saxe -Weimar with the cooperation of the Imperial 

 Physical and Technical Institute in Charlottenburgh. Its immediate aim 

 was to support the manufacture of thermometers in the Thuringian States 

 by officially testing and standardizing thermometers, an undertaking in 

 which the Imperial Institution in Charlottenburgh had already been 

 engaged on a larger scalei The business of the Institution developed 

 in a most satisfactory manner, to such an extent, indeed, that already 

 in the first year the number of thermometers tested and certificated 

 amounted to more than 20000. At the present time, i. e. the beginning 

 of 1893, the number of the tested instruments of this kind exceeds 

 already 80000. 



The Institute extended its operations also to the development 

 and encouragement of the manufacture of instruments within the Thu- 

 ringian States, in particular, that of accurate measuring instruments. 

 The Institute possesses, thanks to the liberality of the grand -ducal 

 government, for this purpose a collection of valuable appliances. 



The Government has also planned the erection of a technical 

 school for glass-blowers and glass-instrument makers, and probably this 

 plan will be carried out in the course of this year (1893). 



The Institute has recently undertaken to test lactometers, lacto- 

 butyrometers , hydrometers for sulphuric acid and saccharometers , also 

 graduated glass measures, with the exclusion of those instruments which 

 are under the control of the Government Assize Department. 



To facilitate the export trade in standardized instruments the 

 Institute supplies certificates with translations in the English, French, 

 Italian, Spanish, Russian, Dutch, Swedish and Danish languages. 



In the thermometric tests the Institute enjoys the cooperation 

 and stands under the control of the Imperial Physical and Technical 

 Institute and affixes to the certificates both its own seal and that of 

 the latter institute. 



The Institute exhibits the following samples of its own manufacture : 



1. A Standard Thermometer for temperatures from 30 to 100 0., 

 each degree being divided into 10 parts; a Chemical Standard 

 Thermometer with scale division ranging from 100 to 200 0., 

 each degree being divided into 5 parts, and with mark indi- 

 cating the zero point; a Chemical Standard Thermometer 

 with scale ranging from 200 to 300 C., divided into half 

 degrees, and marks indicating boiling and zero point. 



