Part 41

Illustrated Booklet giving full particulars and prices of other Instruments and Cases of Instruments sent on application.

Specially arranged Sets of Instruments made for Colleges, Schools, Technical Institutes

Estimates submitted on Application.

Write to our Head Office: CASTLE LANE, WESTMINSTER, LONDON, S.W. 1.

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DRAWING AND SURVEYING INSTRUMENTS

A. G. THORNTON Ltd. SLIDE RULES FOR Paragon Works ACCURATE SECTIONAL ENGINEERS 2 King St. West PAPERS AND CLOTHS MANCHESTER

D 1916 Illustrated Catalogue, just published, in two editions; Drawing Office (448 pages); Draughtsman’s (160 pages): the most complete Catalogues in the trade.

CONTRACTORS TO H.M. WAR OFFICE AND ADMIRALTY Manufacturers also of Drawing Materials and Drawing Office Stationary.

(ALSO AT MINERVA WORKS AND ALBERT MILLS, MANCHESTER.)

MATHEMATICAL INSTRUMENTS SURVEYING INSTRUMENTS SLIDE RULES For Students and Engineers

MANNHEIM, POLYPHASE, DUPLEX, ELECTRICAL, LOG-LOG, AND CALCULEX

J. H. STEWARD LTD. Scientific Instrument Makers

406 STRAND, and 457 WEST STRAND LONDON, W.C. 2

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A True Friend and Trusty Guide

THE ‘HALDEN CALCULEX’

ACTUAL SIZE| | | BRITISH MADE

The handiest and most perfect form of Slide Rule. Does all that can be done with a straight rule. Complete in Case, with book of instructions, 27/6 post free.

J. HALDEN & CO., LTD., 8 ALBERT SQUARE MANCHESTER

Depots—London, Newcastle-on-Tyne, Birmingham, Glasgow, and Leeds

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ENGINEERING, SURVEYING AND MATHEMATICAL INSTRUMENTS, ETC.

SLIDE RULES.

JOSEPH CASARTELLI & SON, 43 MARKET STREET, MANCHESTER. Tel. No. 2958 City.| | | Established 1790.

ROPE DRIVING

Is the most EFFICIENT and most ECONOMICAL METHOD of Power Transmission.

The LAMBETH Cotton Driving Rope