Bioenergetics and growth with special reference to the efficiency complex in domestic animals: by Samuel Brody. 1023 pages, illustrations, 16 × 24 cms. New York, Reinhold Publishing Corporation, 1945. Price $8.50
✍ Scribed by R.H. Oppermann
- Publisher
- Elsevier Science
- Year
- 1946
- Tongue
- English
- Weight
- 144 KB
- Volume
- 241
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
This collection of papers represents a summary of considerable breadth of knowledge of the subject. World War II has caused great demands on the quartz crystal industry both from the production as well as from the development points of view, so this summary is of added importance as a recital of present day position.
There are thirteen papers by five authors in the symposium. The first, by Clifford Frondel gives a history of the quartz oscillator plate industry with special emphasis on the period I94I to 1944. Following this is a paper entitled "The Piezoelectric Quartz Resonator" by Karl S. 'an Dyke wherein are described the properties of quartz, the mechanism of current influence by quartz, the importance of constant frequencies in communication and of the orientation of quartz radio elements. It is predicted in this paper that the powers of quartz in new fields of more extreme frequency precision or into higher frequency ranges have been far from being exploited. The paper following this on the geology of quartz deposites gives information gathered during more than three years work by each of the three authors. The inspection and grading of quartz is the heading of a paper describing the defects of the crystal and their detection, and another paper along the sanle lines treats on the effect of imperfections on the usability of quartz for oscillator plates.
The theory, methods and equipment used in orienting raw quartz and the reorientation of sections, bars, wafers and blanks in various stages of processing are described in the first of a series of papers on quartz-working. Others of the papers include quartz cutting, sawing and machine lapping of quartz oscillator plates. Subsequently, space is given to final frequency adjustment, effect of radiation on elasticity, and secondary Dauphind twinning of quartz. Finally there is a glossary of terms used in the industry.