C. Staudinger & Co., Giessen. 



101 



Charges up to 200 grammes in each pan. Sensibility 0,1 Milligr. 

 Illustrated and descriptive Catalogue gratis. 



B. Department 

 for Physical Apparatus. 



Cathetometer (Fig. 3) 

 of newest and most perfect 

 construction, with bronze 

 prism and solid silver di- 

 vided scale one meter in 

 length. Inclinable tele- 

 scope and level. 



The correction of 

 the telescope, due to 

 errors in the prism, is 

 made on the sliding 

 piece above the focus- 

 sing point of the micro- 

 scope , whereby the 

 errors of the prism are 

 directly compensated. 



The prism and parts 

 are balanced by a coun- 

 terpoise, the whole re- 

 volving on a vertical axle 

 in a complete circle; the 

 prism may be set per- 

 fectly parallel to this axle 

 by means of a micro- 

 meter-screw. 



Air-pumps (illustra- 

 ted by photographs) of 

 approved construction, 

 with double-acting piston, 

 self-acting valve-gear etc. 

 The whole working easily 

 and rapidly by means of 

 a fly-wheel for hand or 

 engine power. 



Evacuation below l / a 

 Millimeter. 



Stands of wood or iron 

 etc. 



Illustrated and descript- 

 ive catalogue gratis. 



