46 SEC. 3. MEASUREMENT. 



longitudinal dividing machine, constructed by George Breithaupt in the year 

 1850, for the temperature of Celsius, as far as O'Ol mm. precision. 



Such normal double meters have been made in large numbers on steel, as 

 well as simple normal meters on brass, for the Imperial Commission of Normal 

 Weights and Measures. 



With this longitudinal dividing machine a length of one meter may be 

 marked uninterruptedly even to the smallest subdivisions. 



296. Standard Scales in Rock Crystal, viz. : 



a. Scale of 10 cm. cut along the axis of the crystal. 



b. Scale of 15 cm. cut in the same manner. 



c. Scale of 20 cm. cut 



The scales are divided into millimeters ; the first and the last 

 millimeter are divided into ten parts. The graduation has been 

 carried out by Mr. Brauer in St. Petersburg. 



Hermann Stern, Oberstein, Principality of Birkenfeld. 



299. Meter in Steel, mortice gauge divided into milli- 

 meters. L. Steger, Kiel. 



301. Apparatus for comparing Standard Measures of 



Length, by Stollenreuther. 



University of Munich (Prof, von Tolly). 



302. Meter in the form of a ruler with all sub-divisions. 



Stddtische Schule at Halle (Mr. Meyer). 



303. Schonemann's Measuring Wedge, with I/ 100 mm. 

 readings. Gewerbe Schule at Halle (Director, KoTilmann). 



304. Schonemann's Measuring Wedge, with 1/1000 mm. 

 readings. Kleemann, Mechanical Engineer, Halle. 



306. Meter-scale in Brass. 



Prof. Baron von Feilitzsch, Greifswald. 



Apparatus, together with No. 3442 and No. 443, executed at the workshops 

 of Messrs. F. W. Breithaupt and Son in Cassel (Province Hesse), and are 

 distinguished by their great accuracy. 



The normal meter is divided, on silver-plated brass, into centimeters, 

 and at both ends into millimeters. 



309. Original Meter Scale of iron. One of the forty 

 specimens which were delivered to the members of the Meter- 

 Commission in the year vii. of the French Republic ; formerly in 

 the possession of Tralles. P ro f- Dr. Dove, Berlin. 



Original Meter Scale by Tralles (of iron). One of the 40 standards which 

 were delivered to the Commissioners. 



Iron Meter a touts. This meter, which was presented to Hapler by Tralles, 

 was one of the three which the latter had made at the same time, by Lenoir, 

 with the 15 which were distributed among the members of the Commission. 



After the completion of the new measurement of degrees performed by 

 Delambre and Mechain, the real length of the meter was determined by the 

 Commission, consisting of, Swinden, Tralles, Laplace, Legendre, Cizcar, 

 Mechain, and Delainbre, in their report of the 6th Floreal year 7, to be 

 443 '29 5936, and the distance of the Pole, by assuming an oblation of ^3, 



