18 April 2023

• curprev 21:5921:59, 18 April 2023‎ imported>Doug Williamson‎ 2,917 bytes +655‎ Add definition - source - linked pages.

29 December 2020

• curprev 22:1222:12, 29 December 2020‎ imported>Doug Williamson‎ 2,262 bytes +35‎ Make image smaller.
• curprev 00:4600:46, 29 December 2020‎ imported>Doug Williamson‎ 2,227 bytes +12‎ Mend link.
• curprev 00:1200:12, 29 December 2020‎ imported>Doug Williamson‎ 2,215 bytes +111‎ Add illustration.

26 December 2020

• curprev 15:1115:11, 26 December 2020‎ imported>Doug Williamson‎ 2,104 bytes +1,026‎ Layout.
• curprev 14:2614:26, 26 December 2020‎ imported>Doug Williamson‎ 1,078 bytes +15‎ Add link.

15 January 2016

• curprev 20:3520:35, 15 January 2016‎ imported>Doug Williamson‎ 1,063 bytes −4‎ Improve calculations.

25 March 2015

• curprev 14:4514:45, 25 March 2015‎ imported>Brianlenoach@hotmail.co.uk‎ 1,067 bytes +15‎ Add link.

15 March 2015

• curprev 13:1713:17, 15 March 2015‎ imported>Doug Williamson‎ 1,052 bytes +4‎ Standardise appearance of page.

14 March 2015

• curprev 15:2515:25, 14 March 2015‎ imported>Doug Williamson‎ 1,048 bytes +12‎ Align presentation of formula with qualification material

13 December 2014

• curprev 21:5421:54, 13 December 2014‎ imported>Brianlenoach@hotmail.co.uk‎ 1,036 bytes +65‎ Expand page.

20 September 2014

• curprev 14:0614:06, 20 September 2014‎ imported>Doug Williamson‎ m 971 bytes +8‎ Added more space so that calculations are clearer

9 October 2013

• curprev 14:0014:00, 9 October 2013‎ imported>Doug Williamson‎ m 963 bytes +31‎ Category added 9/10/13 and spacing

23 October 2012

• curprev 14:1914:19, 23 October 2012‎ imported>Administrator‎ 932 bytes +932‎ CSV import