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Wairarapa Times-Age, 6 December 1939, Page 3

In the Electric Power Board Supply Authorities display at the Centennial exhibition there is a machine that is causing much amusement. It is housed in a cabinet which has a glass rod in the centre and a metal ring about its base. A button labelled “push” generally receives the attention of most visitors, and on pushing, the metal ring leaps gaily up the rod and stays there until the button is released. It is one of the many unusual devices in this display. A feature of more than one automobile exhibit at the Exhibition is the use of ball-bearing testing machines. There is always a crowd about them watching ball-bearings bounce on steel plates, thus testing their resiliency and spherical accuracy. In one demonstrating machine ball-bearings bounce from one plate through a revolving disc on to a second plate and then disappear from whence they came. One visitor stood for an hour in front of this exhibit waiting for a ball-bearing to miss its bounce.