Bauhaus-Universität Weimar

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