Sparks Electrical News May 2015

people on the move 20

The Greek Cross THIS is a Greek Cross, composed of five identical squares. Peter wanted tomake it into a perfect square, so he started from the outside and snipped off four small pieces which he then fitted into the remaining shape, and indeedmade a perfect square.


Antley Lighting

Send your People on the Move photographs (at least 300 dpi) and captions to

Chris Cardoso , sales manager, Pretoria.

Juan-Pierre Potgieter , software engineer, Pretoria.

Anthony Hawley, director, Antley Lighting.

Editor: Erika van Zyl Advertising: Carin Hannay Production & layout: Colin Mazibuko Consultant: Ian Jandrell PrEng, BSc(Eng), GDE, PhD, FSAIEE, MIEEE Managing member: Jenny Warwick Publisher: Karen Grant TOOLSOFTHETRADE Power tools, hand tools, tool storage, scaf- folding, test and measuring instruments/ tools and accessories (DMMs, impedance testers, etc.) measuring supply quality, tool calibration, bakkies, trailers, protective clothing standards. MV/LV systems, transformers, mini-subs, suspension devices, poles, switchgear, control gear, quality of supply protection, load control, cables and cable accessories, cable and jointing techniques, metering, energy management, energy efficiency, timers, load shedding, load balancing, test- ing equipment, hazardous areas, flame- proof equipment. Amixed collection The six wings mean that Tommy kept the three birds, which had three heads and six legs. Leaving out the birds entirely, we know that his remaining pets had a total of 12 heads and 32 legs. Rabbits dogs and cats have four legs each, and 32 ÷ 4 = 8. The four remaining heads prove that Tommy kept a total of four snakes. Jane , however was not impressed.“You didn't need tomake four separate cuts,” she complained.“You could have divided it into four pieces with just two cuts straight-through the centre so that the pieces fitted together tomake a square.” Peter thought for a while. “Well, I see that you are right,”he said eventually, “but I wouldn't have saved anything, because your two cuts are just as long in total length as my four short cuts!” Can you discover Peter and Jane's methods of dissecting the cross into a square? April solution JUNE FEATURES ENERGYMEASUREMENT &SUPPLY

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The views expressed in this publication are not necessarily those of the editor or the publisher .

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may 2015



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