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Dear Hawk, Your accuracy and attention to detail are legendary,

31st January 1991
Page 24
Page 24, 31st January 1991 — Dear Hawk, Your accuracy and attention to detail are legendary,
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Which of the following most accurately describes the problem?

Keywords : Nothing, Vacuum, Hawk

so I'm sure you will be interested in the outpourings of an over-educated exphysicist.

So writes Graham Cannings of Worcester Park, Surrey, causing the Hawk's feathers to puff up with pride — and read on.

Graham is concerned about a story in CM (13-19 December 1990) which reported: "Bodybuilder Allan Fuller has put a vacuum tanker on a Mercedes 6x4 which can suck material from depths of more than 30 metres."

Not so, says Graham. "You cannot suck anything from depths of more than 30 metres . . . the limit is set by atmospheric Pressure — about 26 feet (8 metres) of water; rather less for anything denser (76mm of mercury, for example)."

So was Allan Fuller exaggerating? Chris Yeatman, general manager of the Chepstowbased firm, explains: "Graham is right — with a plain vacuum tank you cannot suck from more than 26 feet — but ours is not a true 'suck'. We have introduced a second pipe which sends a blast of air at very high speed on to the material at the bottom of the pit, atomising it. In simple terms it excites the contents into a frenzy of globules allowing it to be sucked up. It's a phenomenal pump."

If Graham wants to see the pump in action, Chris suggests he should contact Tankerwaste, the customer featured in the CM story, on (0634) 252190. The Hawk hopes, Graham, that the legend remains undiminished. • The Surrey Wildlife Trust says that plans to widen the M25 from six lanes to eight could destroy the natural habitat of "an outstanding bird Icommunity".

Species affected range from the tawny owl to the lesser spotted woodpecker.

The Hawk, feathers understandably ruffled by the claim, will be watching the birdies for future developments.

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Locations: Surrey

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