No. 51738. 



Chronometer, Reading Machine, Chronograph. 



249 



51730. 1:12. 



51 731. 1 : 10. 



51 736. 1 : 4. 



51735. 1:4. 



Two electro-magnets are moved along the cylinder, working two pens. One of the electro-magnets s. d. 

 receives a rush of current every second from a suitable precision pendulum clock or a chronometer 

 fitted with an electric contact, so that seconds marks are made in the form of projections on the screw 

 line which the pen leaves behind it on the cylinder. The other electro-magnet is actuated by rushes 

 of current, which are given off indirectly or directly by the phenomena to be registered. 



The registrations of the scribing magnet are immediately alongside each other and can be measured 

 by means of a flexible millimetre rule or a reading machine. The clockwork can be wound up without 

 interrupting work. 



51.732. -- idem, length of a second 15 or 20 mm Extra Price 3. 0.0 



51.733. Marine Chronometer with electric seconds contact (precision instrument) 120.0.0 



51.734. Pocket Chronometer with electric seconds contact 23. 0.0 



6. 0.0 



51.735. Reading Machine for cylinder diagrams, Figure, for dividing into 10, 100 or 

 1000 parts the seconds recorded by Chronographs Nos. 51,731 and 51,732 



51.736. Strip Chronograph, Figure, with spring clockwork; length of a second 10 mm; 



time of observation: to 17 minutes; with 2 electromagnets 23. 0.0 



The record is made in the same manner as with the previous cylinder chronographs; instead of j 

 the pencil a style can be inserted. If desired, a weight-driven clockwork arrangement can be sup- 

 plied at an extra price of 2. 15.0. This clockwork is arranged to run for 30 minutes; by lengthening 

 the Gall chain from which the weight is suspended it is possible to prolong the time of running. Extra 

 price on application. 



51.737. -- idem, with 3 Electro-magnets, for registering the duration of two phenomena 26.10.0 



51.738. Carrying Case for strip chronograph No. 51,736 2.10.0 



Cl. 5706, 4849, 

 4848, 4888. 



