pigment of yellow wool

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504 CURRENT TOPICS. [J. F. I. Pigment of Yellow Wool.--Lanaurin, the golden pigment of the wool of certain sheep, has been studied by CLAUDE RIMINGTONAND A. M. STEVCART (Proc. Royal Soc., London, 1932, B z/o, 75-9I). They find that lanaurin apparently is a pyrrole complex, inter- mediate between the bile pigments and fully condensed melanin. It is produced from the hemoglobin of the blood by an inherited hyperactivity of certain cells, which are known collectively as the reticuloendothelial system, is secreted in the perspiration, and dyes the wool. J. S. H. Damming the Dnieper.--(Engineering News-Record, Io8, 877.) The Dnieprostroy hydro-electric and navigation project is located in the republic of Ukraine in south-central Russia, at a point on the Dnieper river near Kichkas, about 200 miles above where the river discharges into the Black Sea. Although the river is navigable both above and below the point chosen for the power site, a stretch of rapids at this location necessitates the construction of locks. According to a 46-year record the rivers flow ranges from 6,300 to 720,000 sec.-ft. In the great flood of I93I the flow amounted to 835,000 sec.-ft. In deciding the generating capacity that should be installed, consideration was taken of the flow, the probable load factor which ultimately would develop in this territory; the cost of steam power and the unit cost of the hydro-electric installation; the fact that the storage capacity of the reservoir behind the dam amounted to 39,000,000,000 cu. ft. for a 2o-ft. drawdown; and, that the major part of available power would be used for the production and manu- facture of ferrous and non-ferrous metals in the vicinity of the power site. As a result, an installation of nine units, each of 84,ooo hp rated cap~city at average head, a total of 756,000 hp, was decided upon. The main dam extending entirely across the river channel is I4O ft. high to the crest of the spillway and almost 200 ft. to the top of the piers. The spillway has been designed for an overflow depth of 30 ft. The total length of the dam is 2,500 ft. and has a radius of curvature of I968. 5 ft. The method of construction was similar to that found successful in this country. It consisted in first building a row of piers across the river, then closing off the openings between the piers during periods of low water. These piers, in addition to taking the thrust of the crest gates, support a track for the gate-operating cranes and a highway bridge. On the left bank are three navigation locks having lifts of 41 ft. each. On the right side of the river, the power-house bulkhead,

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Page 1: Pigment of yellow wool

504 CURRENT TOPICS. [J. F. I.

Pigment of Yellow Wool.--Lanaurin, the golden pigment of the wool of certain sheep, has been studied by CLAUDE RIMINGTON AND A. M. STEVCART (Proc. Royal Soc., London, 1932, B z/o, 75-9I). They find that lanaurin apparently is a pyrrole complex, inter- mediate between the bile pigments and fully condensed melanin. It is produced from the hemoglobin of the blood by an inherited hyperactivity of certain cells, which are known collectively as the reticuloendothelial system, is secreted in the perspiration, and dyes the wool.

J. S. H.

Damming the Dnieper.--(Engineering News-Record, Io8, 877.) The Dnieprostroy hydro-electric and navigation project is located in the republic of Ukraine in south-central Russia, at a point on the Dnieper river near Kichkas, about 200 miles above where the river discharges into the Black Sea. Although the river is navigable both above and below the point chosen for the power site, a stretch of rapids at this location necessitates the construction of locks. According to a 46-year record the rivers flow ranges from 6,300 to 720,000 sec.-ft. In the great flood of I93I the flow amounted to 835,000 sec.-ft.

In deciding the generating capacity that should be installed, consideration was taken of the flow, the probable load factor which ultimately would develop in this territory; the cost of steam power and the unit cost of the hydro-electric installation; the fact that the storage capacity of the reservoir behind the dam amounted to 39,000,000,000 cu. ft. for a 2o-ft. drawdown; and, that the major part of available power would be used for the production and manu- facture of ferrous and non-ferrous metals in the vicinity of the power site. As a result, an installation of nine units, each of 84,ooo hp rated cap~city at average head, a total of 756,000 hp, was decided upon.

The main dam extending entirely across the river channel is I4O ft. high to the crest of the spillway and almost 200 ft. to the top of the piers. The spillway has been designed for an overflow depth of 30 ft. The total length of the dam is 2,500 ft. and has a radius of curvature of I968. 5 ft. The method of construction was similar to that found successful in this country. I t consisted in first building a row of piers across the river, then closing off the openings between the piers during periods of low water. These piers, in addition to taking the thrust of the crest gates, support a track for the gate-operating cranes and a highway bridge.

On the left bank are three navigation locks having lifts of 41 ft. each. On the right side of the river, the power-house bulkhead,