278 



Whirling Tables and Accessory Apparatus. 



No. Slew 



51 949 A. 1:9. 



51 952. 1 : 8. 



51 949 B, 52043. 1:6. 



51 948. 1 : 5. 



51 959. 1 : 8. 



51,948. Central Force Electromagnet and Iron Ball, the latter arranged for suspension, B. d. 

 Figure (M. P. I, Fig. 125) 1. 15. o 



If the pendulum is moved from the position of rest and then simply released, it swings to 

 and fro in a straight line; if it is submitted to a slight lateral motion, it describes an ellipse, the 

 most distant focus of which lies over the point of the magnet. If the lateral motion is stronger, 

 circular motion results, and if still greater, elliptic motion again takes place, and the tip of the magnet 

 lies below the nearest focus. 



Whirling Tables and Accessory Apparatus. 



The machines have a massive iron frame, and they can be used both horizontally and verti- 

 cally; in the latter case they are screwed on to the table. The rotating parts are most carefully 

 ((instructed; the axis being most accurately machined and ground in so as to run quite true. Bach 

 of the pieces of auxiliary apparatus made by us fits every machine which we construct. If we arc 

 required to fit apparatus to whirling tables constructed by other makers, it is desired that the axis 

 may be sent us, if the apparatus have only to be fitted to the axis. The frame is bored through 

 laterally from the axis, this boring being provided with a thread for taking various devices on either 

 side. There are supplied with the machines a disc with pin for inserting in the axis of the whirling 

 table and with nut for fixing siren-discs, colour-discs, a stroboscopic cylinder, or the like to the 

 lower end of the axis; also a hook at the lower end of the axis for suspending pendulums, etc. 



Special attention may be directed to the larger Machines Nos. fd.it.V.i et se<|., which can be 

 screwed horizontally to the table and thus admit of being employed in many different wa\ s. 



In order to show the many-sided uses of the whirling tables, the following apparatus, taken 

 from all branches of physics, can be used with the tables, and we would remark specially that they 

 mostly replace isolated apparatus, and are therefore much cheaper than the latter. 



ri. 



5681. 



