A series of 24 Scales for showing the comparative bulks and weights of equal quantities of the metals, woods, stones, and materials principally used in the arts. Contraction Rules, used in making foundry patterns.

Any of the above, and many other Scales (fully described in the Pamphlet), graduated on separate slip. of Card Board, 18 inches long, at 9*. the dozen, or separately, at is. each. If ruled to order, 2s. each. Cases covered with cloth, for one dozen. 1s. Cd., for two dozen, 2s. each.

THE LIBRARY, SKETCHING OR POCKET-BOOK SCALE.

A rectangle of card, 4 1/4 by 2?, cut out in the annexed form, and divided on the several edges. It combines the Protractor, and all the usual Scales for Drawing, and it may be used as a set square, or bevil, parallel rule. Marquois Scale, etc Price, on card, lis., is., 5s., according to the number of graduations.

THE ODONTOGRAPH,

Invented by the Rev. R. WILLIS, A.M., F.R.S., Jucksonian Professor, Cambridge, §c.

This is an Instrument of easy application, used for describing the teeth of wheels by circular arcs, so that any two wheels of a set may cork truly together. Price of the Odontograph on card and Vanuatu

The theoretical explanation of this system of teeth, which has been extensively adopted by practical men, will be found in the Trans. Inst. Civil Engineers, Vol. II., and in Willis's Principles of Mechanism, 1812.

Advertisements Vol 1 Part 2 100155

HOLIZAPPFFEL & Co.,

N°. 64,

CHARING CROSS, LONDON,

ENGINE, LATHE, & TOOL MANUFACTURERS, AND GENERAL MACHINISTS,

To the Hon. Board of Ordnance, teh Hon. East India Company, etc., etc.

TURNING, PLANING, SCREW AND WHEEL CUTTING, FRAMING, &C. IN METAL AND WOOD TO DRAWINGS OR MODELS.

Amateurs

AUK SUPPLIED WITH The APPARATUS, TOOLS, AND MATERIALS, THAT ARE REQUIRED

IN TURNING AND THE MECHANICAL ARTS GENERALLY, AND ARM

ALSO PRACTICALLY INSTRUCTED IN THEIR USE,

Tools and Instruments for

RCHlTECTS. BOOKBINDERS. BRUSHMAKERS. BUILDERS. CABINETMAKERS. CARPENTERS. CARVERS. CLOCKMAKKRS.

COACHMAKERS.

COPPERSMITHS.

ENGINEERS.

ENGRAVERS.

GARDENERS.

GUNMAKERS.

HARNESSMARERS.

HATTERS.

JEWELLERS.

MACHINISTS.

MASONS.

MILLWRIGHTS.

MODELLERS.

OPTICIANS.

PAINTERS.

PLASTERERS.

PLUMBERS.

PRINTERS.

SADDLERS.

SEAL ENGRAVERS.

SILVERSMITHS.

SMITHS.

SURVETORS.

TINSMITHS.

TURNERS.

WATCHMAKERS. WHEELWRIGHTS. WIREDRAW ERA.

Cutlery of every Description.

AN EXTENSIVE ASSORTMENT OF

TOOL CHESTS, DRRSS1NG CASES, DRAWING AND MEASURING INSTRUMENTS,

PRINTING PRESSES, GARDEN TOOLS, &C.

MANUFACTORY, 127, LONG ACRE.

FOREIGN ORDERS, RECEIVED EITHER DIRICT OR THROUGH AGENCY HOUSES, EXECTUED.

WITH EXACTNESS. AND DISPATCH

Advertisements Vol 1 Part 2 100156

HOLTZIFFEI & CO'S Compound Oval and Eccentric Chuck.

Advertisements Vol 1 Part 2 100157

Each Specimen on the other tide is the result of a different Apparatus.

This page shows the effect of the same Apparatus, when employed in conjunction with the Rose Engine.

Although only one Specimen of each individual Apparatus is given, yet the Patterns, which may be considered almost endless, depend on the skill and taste of the Operator.

Advertisements Vol 1 Part 2 100158

Cormetric Cluck combined with the Rose Engine

Advertisements Vol 1 Part 2 100159

Stright Line Chuck combined with the Rose Engine.

Advertisements Vol 1 Part 2 100160

HOLTZAFFEL & Co's Compound Oval and Eccentir Chuck with the Rose Engine.

ADDRESS.

It is a source of extreme gratification to H. & Co., to notice the extent to which the Mechanical Arts, and more particularly that of Turning, are pursued; the Turning Lathe, in its various modifications, assisted by its appendages of mechanism, being at present absolutely essential to some stage of every manufacture.

The cultivation of Mechanics by Gentlemen who have the advantages of general acquirements and of leisure, has given rise to many ideas and suggestions on their part, which have led to valuable practical improvements. H. & Co. have a large share of these obligations to acknowledge, but it would obviously be extremely difficult to particularise them, as the ultimate form of any successful piece of mechanism is commonly the result of many successive modifications.

In some cases H. & Co. have been furnished by Gentlemen with the theoretical and general sketch of machines, the details of construction being entrusted partially, or wholly, to themselves; and in others they have merely carried into practical effect the finished designs.

To each of the Gentlemen by whom they have been favoured with communications, as well as to those whose names appear in this Catalogue, they beg to return their most sincere thanks, with the assurance that it would give them great pleasure to make further additions to this list under similar circumstances.

The public is respectfully invited to inspect H. & Co.'s ware-rooms, where may be seen the principal part of the tools and machines specified in this list; but of these numerous apparatus, some few are only made to order, and others cannot be always in readiness; consequently, drawings of nearly the whole are in preparation, to supply this inevitable deficiency. The drawings are often found to assist foreign Gentlemen, and others, who experience inconvenience from being unacquainted with the technical names of the various apparatus.

Amateurs who desire to receive instruction in Turning or Mechanical Manipulation generally, can receive lessons from H. & Co.'s experienced workmen, either in rooms fitted up for the purpose at Charing Cross, or at their private residences, in town or country.