Volltext: Reports of Visits to Foreign Laboratories, vol. 1 (1907) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith (1)

mercurial thermometers made by Geissler and calibrated by the Phys¬ 
ikalische Technische Reichsanstalt. In construction they are very 
similar to the ordinary Beckmann thermometer and are bent at right 
angles like the bent thermometers used in the Middletown calorime¬ 
ter. They have the column calibration of a milk scale and the 
mercurial column is in a fine capillary tube inside of a glass 
envelope. They are very long and fragile and very hard to trans¬ 
port, although Prof. Hagemann has had two sets shipped to Berlin 
nd returned without being broken. Special transportation cases 
were made for them. They were graduated from -1.0° to -+20.0° in 
l/l00th degrees. 
The method of reading the thermometers is very ingenious and 
worth copying. Two telescopes are mounted on a sliding rod. 
These are adjusted with two mirrors so that there is a maximum 
illumination of the mercurial column, a great convenience in 
reading. Naturally, the use of the telescope also avoids the 
errors of parallax. The only objection is that the telescope 
must be focused each time by each observer. 


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