Middlekauff W W (55 results)

Soft cover. Condition: Very Good. No Jacket. Very good+ softcover, gray wraps. Volume 14, No. 2 pp 51-174 in the series University of California Publications in Entomology. Clean and unmarked interior. Previous owner's name at top of front cover. Few spots of abrasion, one at top of front cover near spine and a couple on spine, one which affects printing. Age toning to approx 1" edges of covers. Binding is solid. A nice copy.…

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

Paperback. Condition: New.

Condition: New.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

Soft cover. Condition: Very Good. 1960. Insects, Journals. Bulletin of the California Insect Survey Volume 6, number 4. ex-library no pockets, verygood brown paperback cover 59-77p. 4/25.

HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000.

Condition: As New. Unread book in perfect condition.

HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000.

Condition: New.

Soft cover. Condition: Very Good. 1st Edition. Very good softcover with prior owner stamp on inside front cover, clean & unmarked pages, sunned spine & toning to wraps. 90 pp. B/W illustrations/photos. See photo, ships same day or next day.

Condition: New.

Soft cover. Condition: Near Fine. Bulletin of the California Insect Survey, Volume 6, No. 4. Unmarked copy.

Condition: gut. 24 S., Abb., 30 cm, gebräunt. Sprache: Englisch.

Condition: gut. 84 S., Abb., 25 cm, Bibliotheksexemplar, Ecke leicht geknickt. Sprache: Deutsch.

Condition: gut. S. 59 - 77, Abb., 30 cm, leicht gebräut. Sprache: Englisch.

Condition: New.

Condition: Very Good. 100, 15 plates, distrib maps. A4. PB. Wrappers. Vg. From the library of K.G.V Smith (1929-2017) with his stamp to front wrapper. University of California Publications, Bulletin of the California Insect Survey, Vol. 22. [9780520096042].

Condition: As New. Unread book in perfect condition.

Pamphlet. iv, 25p., stapled wraps, 5.75x9 inches, wraps toned along edges, else very good condition. This report by UC Berkeley faculty on the treatment of African American subjects in history textbooks used in California appeared in various formats.

Paperback. Condition: New. Print on Demand. This book, a thorough exploration of gas-filled lamps, delves into the new variables and photometric difficulties encountered in their use. The author, a renowned scientist at the Bureau of Standards, presents a systematic study of these variables, determining the relationship between voltage, current, speed, and candlepower when the lamp is rotated. This study led to the discovery of a unique phenomenon: at constant voltage, current and candlepower change in opposite directions when the lamp is rotating. The author further explains the cause of this variation, attributing it to changes in convection currents within the bulb, which in turn affects the temperature distribution and resistance of the lamp. Through careful experimentation, the author establishes a practical method for accurately measuring mean horizontal candlepower in gas-filled lamps, free from the errors caused by rotation. This method, along with the author's in-depth analysis of the underlying principles, enhances our understanding of gas-filled lamps and aids in their precise photometry. 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. Condition: New. Print on Demand. This book examines an interlaboratory comparison of photometry measurements involving color differences. The study looks at the agreement among observers and laboratories in measuring the transmission of glass screens and the candlepower of tungsten lamps at various voltages. The results show that each observer maintained a consistent criterion within their laboratory, and each laboratory showed good agreement with the mean of all laboratories, regardless of the type of photometer used. Importantly, the measurements also align closely with average eye perception, as determined in a separate study involving a large group of observers. These findings highlight the importance of careful observer selection and standardized conditions when establishing photometric standards involving color differences, especially for precision measurements. 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. Condition: New. Print on Demand. This book explores the history and techniques of life testing for incandescent lamps by the US Bureau of Standards. It covers the Bureau's early work in setting standards, the development of the Bureau's own testing equipment, the meticulous process of selecting representative samples for testing, and the careful measurement procedures used to ensure accurate results. The book also discusses the complexities of evaluating life test results, taking into account factors such as voltage regulation and lamp efficiency. Through a detailed examination of the Bureau's methods, the author provides valuable insights into the science and practice of life testing, a crucial part of ensuring the quality and performance of incandescent lamps. 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. Condition: New. Print on Demand. This book presents a significant investigation into the characteristics of vacuum tungsten filament lamps, with a focus on their voltage-candlepower and voltage-watts per candle relationships. The author, a respected expert in the field, meticulously analyzes observed data and derives a set of fundamental equations that accurately express these relationships over a wide range of operating conditions. The book explores the implications of these equations for standardizing lamps and provides practical methods for reducing observations at any given watts per candle to values they would have at any other watts per candle. It also examines the use of exponents and differential coefficients in lamp characterization and discusses the potential impact of changes in filament material on lamp characteristics. The author's rigorous approach and clear explanations make this book an invaluable resource for researchers, engineers, and anyone interested in the design, manufacture, or use of incandescent lamps. Its insights will help advance the understanding and utilization of these essential lighting sources. 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.…