To the Editor Dear Sir, I wish to make some comments on the article in your August issue entitled ‘Some Notes on Centrifugal Compressors’ by L. N. Thompson. This is a distinct contrast to the article by Professor Baxter in the previous issue comparing axial and centrifugal types, which was excellent, being objective and making all the important points most fairly and clearly. The present article is very loosely worded and is, in fact, positively misleading in parts.