ENGINEER'S VALUING ASSISTANT BEING A PRACTICAL TREATISE ON THE VALUATION OF COLLIERIES AND OTHER MINES WITH RULES, FORMULE, AND EXAMPLES ALSO A SET OF VALUATION TABLES CALCULATED ON THE PRINCIPLE OF ALLOWING INTEREST TO A PURCHASER OF ANY ANNUITY, BENEFIT, OR OF INTEREST AND TABLES OF VALUE SHOWING THE DISCREPANCIES EXISTING IN THE ORDINARY TABLES OF PRESENT VALUES AND THE ERRORS CREATED BY THEM BY H. D. HOSKOLD CIVIL AND MINING ENGINEER; CHIEF OF THE ARGENTINE GOVERNMENT WITH AN INTRODUCTORY NOTE BY THE LATE PETER GRAY HONORARY MEMBER OF THE INSTITUTE OF ACTUARIES AUTHOR OF TABLES AND FORMULE FOR THE COMPUTATION OF LIFE CONTINGENCIES' ETC, LONGMANS,FOGREEN, AND CO. 39 PATERNOSTER ROW, LONDON NEW YORK AND BOMBAY 1905 All rights reserved PREFACE ΤΟ THE PRESENT EDITION. SOON after the first edition of this work appeared in 1877, copies of it became so scarce that suggestions were frequently made to the author to publish a new edition of it; but, at that time, important professional duties and undertakings led him to foreign countries, including the Argentine Republic, in the latter of which he has had the honour of occupying the position of Chief Advising and Acting Mining Engineer to the National Government for over a period of 18 years. The onerous duties of that office, and other matters connected therewith, absorbed the whole attention of the author, and it is only recently that he has been able to prepare a second edition of his 'Engineer's Valuing Assistant' for the press. For various practical reasons, the original book of 1877 has been reduced in bulk; but, at the same time, everything essentially necessary to aid the profession in the valuation of mines and other properties has been retained in the present edition. The deferred periods, in Table X, have been reduced from 10 to 4 years, for the reason that it is considered that a period of from 4 to 5 years is a sufficiently long time to wait before benefit accrues from mining undertakings. 158950 Tables XIV, XV, XVI, XVII, and XVIII, giving deferred periods up to 5 years, have been retained to meet special cases. The general examples of mine-valuation, occurring in the first edition, are omitted, a single leading example, with peculiar characteristics, having only been retained. The excellent and important Introductory Note,' contributed to the first edition by the late lamented Mr. Peter Gray, one of the ablest mathematicians of his time, has also been retained, not only on account of its great value in demonstrating scientifically the correctness of the principles laid down by the author, but as a memorial to that distinguished scientist. The references only have been altered, to agree with present pagination. The author again takes this opportunity of expressing his thanks to the scientific press for the favourable opinions manifested upon the merits of the first edition, and he is content to present this second edition to their consideration, liberality, and just appreciation. BUENOS AIRES: May 1, 1904. |