A precision portable grating unit for measuring hobbing machine transmission errors.
Smith, Philip,C.Eng., A.M.I.Mech.E.
Macgregor, P.
East Kilbride, 
1966.
[With a bibliography.]
Duplicated.
Joint authors: Philip Smith, C.Eng., A.M.I.Mech.E. and P. Macgregor.