Bauhaus-Universität Weimar

Titel:
Reports of Visits to Foreign Laboratories, vol. 1 (1907) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Person:
Benedict, Francis Gano
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39744/317/
303 
oîi lie inverted drawer has an ocular that permits of aicroroeter rat .sure— 
rænts of the differences between two gradations on a thermometer, tb-p. 
comparing with the micrometer lunette in Tissot »s laboratory. 
Another view of the electrical measuring apparatus is ' . 
Pig. 97, the three resistances in front of the compensât! ; 
with the wooden cover being plainly seen. The stone pillr ■ i 
___ 
supports the telescope and . , ,. .. ;——. p-cale as well as 'be pi ft r, 
paraffin used with switches shown in Fig. 95. The normal résista:., 
used in con action with the compensating apparatus is on the f'~:' b 
the table in an oil bath. 
Compensât!on apparatus.—The compensation a paratro ■ 
by ’’-o/lff in Berlin and is recommended in the highest terre- F 
ikalisch^-Teehnische Eeichsanstalt. This apparatus has t 
for the Nutrition Laboratory. It has obviously inrrar rab' r ;■ 
than that of measuring the temperature rise in the bomb a: ■' 
Tbinor points regarding combust! ns.—The highest tempe -v. o 
calorimeter system is obtained in 25 seconds, with measuremt; fee .Itl an 
electrical thermometer. The apparatus is stirred with a mover . t ,;V **' 
strokes per minute with.the stirrer. With a mercury thermometer, the 
highest temperature Is not reached for one and one-half minutes. 
When it is remembered that in the combustions made with the Berthelot- 
Atwater calorimeter, with a mercury thermometer, the maximum temperatu- 
rise was not attained for three minutes or over, the f ct ‘hat t! ' : 
temperature is attained at the end of 25 seconds seems almost incred?bl . 
*t is a fact, however, that the Froeker bomb contains much less metal 
than does the Berthelot-Atwat er bomb calorimeter and therefore must 
impart its heat much more readily to the water. Secondly, the resist -.••nee 
thermometer has practically no lag' while the mercurial thermometer has
        

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