Clemens Riefler, Mimchen and Nesselwang. 61 



]N T 0. 2780. 



Clemens Riefler, Miinchen and Nesselwang. 



(Bavaria.) 

 Manufactory of Mathematical Instruments. 



This firm is exhibiting: 



1. In two show cases: 



Drawing and Measuring Instruments, in particular 

 original drawing instruments (German Patent No. 2907.) 



2. In a third case: 



a.) An absolutely Free Pendulum Escapement with 

 impelling action in the axis of oscillation (German 

 Patent No. 50739). 



b.) A Mercurial Compensation Pendulum (German 

 Patent No. 60059; U. & Patent applied for). 



3. In a fourth case: 



An Astronomical Clock fitted with the escapement 

 and pendulum 2 a. 



I. 



The drawing instruments, which form a speciality of the firm, are 

 of the construction shown in the illustrations and are well known in 

 the technical world as ,,Riefler's Round System Compasses' 4 . The 

 popularity which they have attained is a sufficient proof of their excel- 

 lence of construction and workmanship, which is secured by a number 

 of special machines fitted with the latest improvements. It will be 

 well to here mention that poor imitations of these instruments 

 are placed upon the market; to prevent these being confounded 

 with the Riefler instruments each of the latter has the name of 

 ,, Riefler" stamped upon its head. 



Detailed descriptions of these instruments and specifications of 

 their advantages over the older types written by autorities may be 

 found in the following publications: 



Bayer. Industrie and GewerbeUatt, No. 6, 1886. Dingier' s Poly- 

 techn. Journ. Vol. 241, No. 4. Der prakt. Maschinenconstructeur, No. 328. 

 Wochenschr. des Vereins deutsch. Ingenieure, 1878 No. 22; 1881 No. 16. 

 Leipzig. Illustr. Zeitung No. 1987. ' U Industrie moderne 1889, No. 10. 

 Revue industrial, 1889. Railway Review, vol. XX VIII No. 15. The 

 Tradesman, vol. XIX, No. 4. The Builder and Decorator, vol. Ill 

 No. 1. The Philadelphia Carpet Trade, vol. 6, No. 2. Building, vol.. 



