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Copyright
Portions of any work that are quoted are reproduced on the basis of the "fair dealing for purpose of criticism or review" section 41 of the Copyright Act 1968.
let's look at the Australian Copyright Council's fact sheet on Fair Use:
The Federal Court has stated that “criticism and review” involves making a judgment of the material concerned, or of the underlying ideas. Criticism and review may be strongly expressed, and may be expressed humorously, and need not be balanced. The defence can apply where the criticism or review takes place in a commercial context, such as in published books or newspapers or on commercial television.
However, the court emphasised that the purpose of criticism or review must be genuine. If the person has other motives – especially if these motives involve using the material to make a profit, or using a competitor’s material to
divert customers from the competitor – the fact that they have also engaged in a form of criticism or review is not
enough to prevent the use from infringing copyright
All other content on this site is copyright Iain Hall and may not be reproduced in any form with out explicit permission of the author.
Comment Copyright
Anyone who comments at the Sandpit under a pseudonym does so on the clear understanding that by doing so they are giving any and all rights and ownership of those comments to the site-owner who may reproduce them in any form or at any other site or venue entirely at his own discretion.
Iain Hall's SANDPIT 
Thanks Iain. I haven’t been doing anything with that for a while. I’ve been laid up. A guy with a very sharp knife removed my oil pump to put a new discharge valve in it and it took a while to heal up. Really good now though.
http://www.onxlti.com/medical-professionals/on-x-prosthetic-heart-valve-design-and-features/
that is an amazing bit of kit you have there! I’m glad its done the business for you mate!