Correspondence with M.H. Jeffery and J.V. Hindman. Hindman comments on Redman's Site Testing Report, mentions testing problems, and encloses a copy of the calibration plot for a unit taken to Sydney. A telegram by Hindman of 17 April discusses an error made in calculations from the anemometer system checked in the wind tunnel at Sidney, which Redman describes as 'shattering' in his letter of 22 April. There is also a letter from D.W. Cunliffe to Redman, 8 April 1968, agreeing with Hindman on the uncertainty of hand-held anemometer calibrations, and a copy of a letter from Cunliffe to M.H. Jeffery, dated in pen 'about' 1 May, enclosing notes on air velocity measurements and their interpretation.