246 



Measurement of Time. 



No. 51 OSS 



51 698. 1 : 15. 



51 701. 1 : 14. 



51 703. 1 : 10. 



51.698. Seconds Pendulum, in Cardanic suspension, with audible seconds beat, with firm iron 

 stand fitted with levelling screws, Figure (Fr. phys. Techn. I, 2, Fig. 3364) . . 



The pendulum bob is adjustable, so that this pendulum is at the same time adapted for ex- 

 plaining the law of the pendulum. 



51.699. - - idem, with electric contact device for combining with the electric dial No. 51,705 



51.700. Seconds Pendulum with wall bracket 



51.701. Seconds Pendulum with audible beat, with dial and projecting pointer, on iron stand 

 with levelling screws, Figure (Fr. phys. Techn. I, 2, Fig. 3372; Gan.-Man. Fig. 61) 



51.702. - - idem, with electric Seconds Contact and an electric Dial 



The dial is set up at a spot in the lecture room which is easily visible by all. This arrange- 

 ment can be thoroughly recommended for larger lecture rooms. The dial can also be used as an electric 

 secondary clock with the aid of a clock having an electric contact. 



51.703. Seconds Compensating Pendulum, Figure, with 5 brass and 4 steel rods, with 

 audible beat and electric seconds contact, on iron stand with levelling screws, and 

 electric dial 



51.704. Clock with electric Minute Contact, Figure, for use in combination with an 

 electric Dial No. 51,705, neat construction; can also be used as a model of a clock 



51.705. Electric Dial, Figures A and B 



The electric dial is used either with Clock No. 51,704 (having an electric minute contact) and 

 it then serves the function of a secondary electric clock ; or with a seconds pendulum having an electric 

 contact, being then used as an electric seconds clock in fall experiments, etc. 



51.706. Regulator Clock with seconds pendulum, case of oak, with compensating (or gridiron) 

 pendulum 



6. 0.0 

 10. 5. 



(1. 4IH, -111:,, 3296. 



