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Terry Mackenzie-hoy

Terry Mackenzie-hoy

Mackenzie-Hoy is a consulting acoustics and electrical engineer – machoy@iafrica.com

Fallow South Africans

27th November 2020 I don’t speak South African languages with any competence. Our President, apart from his pronunciation of the word ‘fellow’, has a good command of the English language and other South African languages.  When he addresses us on the occasional Thursday, he raises matters of Covid-19 and... 

Sans serif

20th November 2020 Claude Shannon is virtually unknown, but his work was fundamental in the creation of the digital computer. A law which he was partly responsible for is the Shannon Hartley law of information transmission, which states that the maximum amount of information that can be transmitted is proportional... 

2020: The year of wonder

13th November 2020 In my second year at the University of the Witwatersrand, in 1972, (yes, people were alive then and could do sums an’ all) the HP 35 calculator was released onto the market by Hewlett Packard. The calculator weighed only 255 g. Named for its 35 keys, the device enabled users to make complicated... 

Twisting the knife

6th November 2020 In the wonderful musical, Les Misérables, the lead character, Jean Valjean, goes to a hotel to collect the daughter of Fantine. Fantine has been paying a couple who run an inn to look after her daughter, Cosette. When Valjean gets to the inn, the innkeepers make him pay large sums of cash for... 

Religious noise complaints

30th October 2020 There is a film, The Secret of Santa Vittoria.  Santa Vittoria is an Italian town renowned for its vineyards. In the storyline, at some stage the residents realise that the nearby village could hear the sound of the bell in the Vittoria church and use it to mark the time of morning mass. The... 

Hydrogen Power

23rd October 2020 Now that it has finally dawned on some of us that cars with batteries require to be charged and that it takes time for this to happen and its not the same time as needed by the driver to have refreshment… enter the promise of the hydrogen fuel cell car. Now it happens that I own a hydrogen fuel... 

Can’t get thicker than this

16th October 2020 It was reported that, "following months of delay, Mineral Resources and Energy Minister Gwede Mantashe [had] published the Gazette opening the way for the procurement of 4 800 MW of onshore wind, 2 000 MW of solar photovoltaic (PV), 3 000 MW of gas- or diesel-to-power, 1 500 MW of new coal and... 

40 years on

9th October 2020 When I was 19, I fell in love with a girl who was studying at the University Cape Town (UCT). I was studying at the University of the Witwatersrand at the time and had just finished my second, second year of electrical engineering. But, in the July holidays, I had met this girl and decided that I... 

Electrical scams

2nd October 2020 You’ve heard of a ‘microgrid’? I Googled it and found that: “A microgrid is a miniaturised version of the larger grid, a configuration of energy resources, distribution wires and buildings, all within a distinct geographic footprint. There is no size limit, but microgrids tend to be scaled to... 

Wood, trees and very dense forests

25th September 2020 Naked and Afraid is a TV programme which documents American couples who are dropped off at some remote location, clothes removed, and try to survive warm and cold, prepare and eat food, stay hydrated, suffer insects and predators, all for 21 days. Each participant is allowed to take with them... 

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