Reference numberNLB/41/277
Alternative reference numberNLB/41 p180
TitleCopy letter from Robert William Frederick Harrison, to E W Wallis, Royal Sanitary Institute, 90 Buckingham Palace Road, S.W.
Date12 November 1909
DescriptionThe apparatus to which Wallis refers in his letter of 10 November intended for the estimation of dust particles in air, was exhibited by Dr John Aitken. It is believed that the apparatus was made by the Cambridge Scientific Instrument Company.
Physical descriptionTypescript
Access statusOpen
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