Portass Lathes: no manuals were ever issued but there is a wonderful collection of (rare) Sales & Technical Specification Sheets, Individual Machine Catalogues, Illustrations, Accessories and "Letters of Recommendation" available: X.L., Mark V, Model X.

MILNES Lathes, Planers & Accessories Catalogue 1922 showing the Types R, G, B, X, Y, W, Z, I, N, D and K (ornamental turning) 41 pages.

LODGE & SHIPLEY (USA): Model X Lathes.  Full-range Detailed Sales & Specification Catalogue. 28 pages.