This free course was written by Martin Weller and Nigel Gibson.
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Figure 1: Luis Ovalles in Flickr https://creativecommons.org/ licenses/ by-nc-nd/ 2.0/
Figure 2: old photograph: Sludge G https://www.flickr.com/ photos/ sludgeulper/ 4547893005/
Figure 3: old photograph: Roger W https://www.flickr.com/ photos/ 24736216@N07/ 5187567062/
Figure 4: Tom Simpson : https://www.flickr.com/photos/randar/14962680597/
Figure 5: Steve Bustin in Flickr https://www.flickr.com/ photos/ 7953061@N02/ 14265784357/
Figure 6: Massmo Relsig in Flickr https://creativecommons.org/ licenses/ by-nc-nd/ 2.0/
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