duffield p w (18 resultados)

Condición: New.

Condición: As New. Unread book in perfect condition.

Condición: New.

Condición: New. In.

Condición: New.

Condición: As New. Unread book in perfect condition.

Paperback. Condición: New. Print on Demand. This book guides directors and millmen alike on gold processing insights developed before 1890, focusing on the practical, commercial handling of various ores. The author emphasizes the importance of understanding the condition in which gold is lost within a particular oreâ"free, locked in particles, or mixed with sulphuretsâ"and provides simple tests for determining this. The author encourages a focus on maximizing the percentage of gold saved, rather than on overall yield, and notes the crucial role of concentration techniquesâ"particularly the Frue vannerâ"in minimizing losses. A useful distinction is drawn between ores amenable to copper-plate amalgamation and those better suited to chlorination or smelting. While acknowledging the potential of new inventions, the author cautions against hasty adoption and advocates a conservative approach, emphasizing the value of proven processes and experienced personnel. The book's insights on minimizing gold losses and selecting appropriate treatment methods remain relevant today, offering valuable guidance for those involved in the mining and processing of gold ores. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Paperback. Condición: New. Print on Demand. This book explores the development of gold mining and milling systems over a 15-year period. The author argues that many of the methods considered groundbreaking and effective are actually nothing new. Instead, they are old and familiar techniques, sometimes simply repackaged for new audiences. Drawing on data from companies and official reports, this book establishes that the average loss of gold during the milling process is low, making the expensive and complex systems implemented by mining companies a waste of resources. The book offers an in-depth look at gold amalgamation systems and the failures companies have encountered when adopting new machinery. The author then proposes a compromise solution of employing greater skill in copper-plate amalgamation, finer crushing, concentration, and more effective treatment systems, which can significantly reduce the loss of gold and produce higher returns. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Condición: New.

Paperback. Condición: New. Print on Demand. This book is a collection of writings by some of the most prominent scientists of the Victorian era. It presents a comprehensive overview of the state of scientific knowledge in the 19th century, covering topics such as the nature of matter, the origin of life, and the evolution of the solar system. The essays in this book offer valuable insights into the intellectual currents of the time and provide a foundation for understanding the development of modern science. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

Hard Cover. Condición: Very Good. No Jacket. First Edition. 220 x 150mm. pp. 98 + plates. English text. A detailed volume on the subject of mine management. Features section entitled:- Losses in Gold Amalgamation; Treatment of Gold Ores; Concentration of Gold and Silver Ores; Methods of Concentration. six fold-out black and white illustrations to rear. Bound in original red boards with gold lettering to spine and front cover. Library stamps to several pages and plates, but no stickers or labels. A little light marking and bumping to boards and pages, otherwise clean and tight. Binding strong. Ex-Library.

Condición: New. Print on Demand pp. 156.

Hardcover. Condición: Fair. Second Edition. 98 pages plus two pages of advertisements. Six black and white fold-out plates. Intended to "offer a little useful knowledge to directors of English gold mining companies on some of the simple principles that are too often ignorantly, or designedly, ignored, or surrounded with mystery by inexperienced mine managers; also to give to millmen a few suggestions, founded on a tolerably wide experience, in the commercial handling of many kinds of ores." - from Preface. Text divided into the following parts: Losses in Gold Amalgamation; Treatment of Gold Ores; Concentration of Gold and Silver Ores; Methods of Concentration. Prior owner's details in pencil upon front free endpaper else unmarked. Binding intact. Minor foxing. Red cloth covers soiled and stained with above-average wear - gilt lettering still legible. A worthy copy of this practical vintage work.

Condición: New. Print on Demand pp. 156.

Condición: New. PRINT ON DEMAND pp. 156.

LeatherBound. Condición: New. BOOKS ARE EXEMPT FROM IMPORT DUTIES AND TARIFFS; NO EXTRA CHARGES APPLY. LeatherBound edition. Condition: New. Reprinted from 1890 edition. Leather Binding on Spine and Corners with Golden leaf printing on spine. Bound in genuine leather with Satin ribbon page markers and Spine with raised gilt bands. A perfect gift for your loved ones. Pages: 153 NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. As this print on demand book is reprinted from a very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. Sewing binding for longer life, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of binding. Pages: 153.

LeatherBound. Condición: New. BOOKS ARE EXEMPT FROM IMPORT DUTIES AND TARIFFS; NO EXTRA CHARGES APPLY. LeatherBound edition. Condition: New. Reprinted from 1890 edition. Leather Binding on Spine and Corners with Golden leaf printing on spine. NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. Pages: 155 As this print on demand book is reprinted from a very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. Sewing binding for longer life, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of binding. Pages: 155 Language: English.

Leather Bound. Condición: New. Language: English. Language: English. Presenting an Exquisite Leather-Bound Edition, expertly crafted with Original Natural Leather that gracefully adorns the spine and corners. The allure continues with Golden Leaf Printing that adds a touch of elegance, while Hand Embossing on the rounded spine lends an artistic flair. This masterpiece has been meticulously reprinted in 2025, utilizing the invaluable guidance of the original edition published many years ago in 1890. The contents of this book are presented in classic black and white. Its durability is ensured through a meticulous sewing binding technique, enhancing its longevity. Imprinted on top-tier quality paper. A team of professionals has expertly processed each page, delicately preserving its content without alteration. Due to the vintage nature of these books, every page has been manually restored for legibility. However, in certain instances, occasional blurriness, missing segments, or faint black spots might persist. We sincerely hope for your understanding of the challenges we faced with these books. Recognizing their significance for readers seeking insight into our historical treasure, we've diligently restored and reissued them. Our intention is to offer this valuable resource once again. We eagerly await your feedback, hoping that you'll find it appealing and will generously share your thoughts and recommendations. Lang: - English, Pages:- 155, Print on Demand. If it is a multi-volume set, then it is only a single volume. We are specialised in Customisation of books, if you wish to opt different color leather binding, you may contact us. This service is chargeable. Product Disclaimer: Kindly be informed that, owing to the inherent nature of leather as a natural material, minor discolorations or textural variations may be perceptible. Explore the FOLIO EDITION (12x19 Inches): Available Upon Request. 155 155.