Middlekauff W W (56 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.

Condition: New.

Soft cover. Condition: Very Good. Review. 1969. Paper (8-1/2 x 11 in), 19pp, illus., maps (Bull. Calif. Insect Survey, 11). Treats the cephid sawflies of California. VG; slight spine abrasion, otherwise like new.

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.

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.

Condition: New.

Condition: New.

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

Condition: New. In English.

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. In English.

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.

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

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

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

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.…