64, Charing Cross, and 127, Long Acre, London.

The Art Of Double Counting On The Lathe

By MAJOR JAMES ASH.

A Clear and Practical Treatise on the Production of an Extensive Variety of Patterns, Ellipses, Triangles, Squares, Pentagons, Hexagons, and Octagons, 3, 4, 6, and 8 Looped-figures, and others of a more Complex character, by means of the ordinary Eccentric Chuck used in combination with the Division Plate, and the Eccentric and the Elliptical Cutting Frames. With an Appendix by John Jacob Holtzapffel, Assoc. M. Inst. C.E., etc. 8vo, cloth, 74 Illustrations, price 12s. 6d.

Eccentric Turning

By N. B. ENGLEHEART.

A Concise Treatise on Eccentric Turning, to which are added Practical Observations on the Uses of the Eccentric Cutting Frame, the Drilling Frame, and the Universal Cutting Frame. Illustrated by Figures and Eccentric Patterns, with full Instructions as to the Modes by which such Patterns may be effected. Quarto, cloth, 50 Illustrations, price 21$.

Notes On The Epicycloidal Cutting Frame

By THOMAS SEBASTIAN BAZlEY, M.A.

With special reference to its Compensation Adjustment, and with Numerous Illustrations of its capabilities. 8vo, cloth, 111 Illustrations, price 15s. 6d.

Index To The Geometric Chuck

By THOMAS SEBASTIAN BAZLEY, M.A.

A Treatise upon the Description in the Lathe of Simple and Compound Epi-trochoidal or Geometric Curves. 8vo, cloth, 3500 Illustrations, price 42s. The impression of this work consists of 150 copies only, and as the lithographic stones were obliterated as the successive transfers were completed, the book cannot be reprinted. A few copies only now remain on hand.

Descriptive Catalogue Of The Woods Commonly Employed In This Country, For The Mechanical And Ornamental Arts

Interspersed with Extensive Botanical Notes by Dr. ROYLE, F.R.S., L.S.,

AND G.S., ETC., ETC.

8vo, cloth, price 2s. 6d.

A New System Of Decimal Gages Or Measures For Sheet Metals, Wires, And Small Manufactured Articles Generally

Including the exact decimal values of the gages now principally used for these purposes in the Mechanical Arts. Pamphlet 8vo, in wrapper, price 1s.

Printing Apparatus For The Use Of Amateurs

Containing full and Practical Instructions for the use of Cowper's Parlour Printing Press, also the description of larger presses on the same principle, and various other apparatus for the Amateur Typographer.

The pamphlet contains, likewise, numerous specimens of types, brass rules, checks, borders, ornaments, corners, arms, etc. 8vo, cloth, price 2s. 6d.

Holtzapffel And Co.'s General Catalogue Of Lathes, Tools, And Instruments Employed In The Mechanical Arts

Stereotype Edition. 8vo, pp. 72, price 6d., or free by post, 8d.