n. EXPANSION. 255 



997. Gas Lamp, consisting of four Bunsen burners, and 

 provided with an air-regulating system. 



S. Hoogewerff, Dr. Phil., Rotterdam. 



This lamp, which is intended for heating tubes, was constructed by 

 Mr. Verkerck, mechanical engineer, Utrecht, under the directions of Dr. 

 Hoogewerff, and belongs to the middle school at Rotterdam. 



998. Gas Lamp (Bunsen's system), intended for heating 

 porcelain vessels of large size. 



S. Hoogewerff, Dr. Phil, Rotterdam. 



It was constructed, under the directions of Dr. Hoogewerff, by Mr. 

 Verkerck, mechanical engineer, Utrecht, and belongs to the middle school at 

 Rotterdam. 



999. Apparatus for showing the liberation of heat during 

 solidification. Will. Haak, Neuhaus am Rennweg, Thuringen. 



II. EXPANSION. 



lO88a. Apparatus, by Peter von Musschenbroek, a 



Dutch mathematician (born 1692, died 1761), to determine the 

 relative values of the Coefficients of the Expansion of Solid 

 Bodies. Prof. Dr. P. J. Rijke, Leyden. 



1097b. Original Apparatus, by M. Dulong and Petit, for 



measuring the Dilatation of Mercury with overflow thermo- 

 meter. Polytechnic School, Paris. 



1097c. Apparatus for measuring .the expansion of 

 Bodies by Heat. Physical Institute, Freibiirg. 



lO97d. Apparatus to demonstrate the mechanical 

 effects of the expansion of Fluids by Heat. 



Prof. Boscha, Royal Polytechnic School, Delft. 



lO90b. Original Apparatus of Regnault for the Dilata- 

 tion of Gases. College of France, Paris. 



1075. Apparatus for demonstrating the Expansion of 



Solids by Heat. A. Steger, Kiel. 



y 



1090. M. Fizeau's Apparatus for measuring the Co- 

 efficient of Dilatation. 



Conservatoire des Arts et Metiers, Paris. 



1082a. Photograph of M. Fizeau's Apparatus for 

 determining the Coefficients of Dilatation. 



M. Laurent, Paris. 



1082b. Microgoniometer. An instrument for measuring 

 the expansion of metals by heat. Prof. Dr. F. Pfaff. 



