Squeeze film behaviour in rotating porous annular discs lubricated with magnetic fluid, Rajesh C. Shah and M. V. Bhat.

The paper is technically correct. Reduction of special cases to results of previous papers confirms correctness. A graphical rather than a tabular presentation of results would be useful as would be a brief motivation of the choice of configuration - i.e. what are the actual and potential applications. Comments on application of the special cases would be useful.

The subject matter is not a topic in modern physics and is of interest to the engineering community, especially to workers in design and lubrication. Although the results are relevant, no new physics or physical phenomena are presented. There is no new mathematical technique. Therefore, publication in the Canadian Journal of Physics is not recommended.

Instead, publication in a journal that focuses on lubrication may be indicated. The American Society of Mechanical Engineers' Journal of Tribology is the American journal of choice for engineers looking for information in lubrication, combined lubrication and machine dynamics and design, and related topics. For publication in that journal the earlier comments on graphical presentation of results and on applications are worth repeating. Effects on machine performance and vibration -axial, torsional and bending - would be useful. Consideration of offset or off-parallel axes may be useful but would require approximate analytical or numerical solution. Mathematically, stability of the fluid flow configuration would be interesting but of a higher order of difficulty.

I hope that these comments are fair and useful. Although the editorial policy is one of anonymity, I wish to thank the authors for their efforts and contribution… and to wish them success in further endeavours.