Cryogenic flux-concentrator

Flux concentrator has high primary to secondary coupling efficiency enabling it to produce high magnetic fields. The device provides versatility in pulse duration, magnetic field strengths and power sources

On some numerical difficulties in integrating the equations for one-dimensional nonequilibrium nozzle flow

Numerical difficulties in integrating equations for one dimensional nonequilibrium nozzle flow of ga

Notes on the Distribution of the Prairie Spotted Skunk in Iowa

In 1906 the U. S. Department of Agriculture published faunal bulletin No. 26 by Arthur H. Howell, Assistant Biologist of the U. S. Biological Survey on the Revision of the Skunks of the Genus Spilogale . According to this report the only species referred to Iowa is Spilogale interrupta Raf., three specimens of which were examined from this state; one of which came from Gladbrook, and two from Marshalltown. His distributional map shows the range of this species as extending to southeastern Minnesota on the following statement by Mr. E.T. Seton He (E. T. Seton) states that two were killed by a trapper in March, 1904, on the Mississippi River 40 miles southeast of Minneapolis. The animal was previously unknown to trappers in that region, so that this is doubtless an instance of recent extension of range

A Remarkable Flight of Broad Winged Hawks

On Friday a.m., September 22, 1911, a flock of Broad Winged Hawks (Buteo latissimus Wils.), remarkable for its size and compact character, passed about two miles north of Cedar Rapids, Iowa

The Occurrence of Melanism in the Broad Winged Hawk (Buteo latissimus)

During the fall of 1907 Mr. James Ward of Britt, Iowa, sent to the Coe College Museum a hawk of the Genus Buteo, that, because of its color, was difficult to identify. It was so similar to a specimen seen by the writer in the collection of mounted birds at the Smithsonian Museum in Washington, that at the suggestion of Mr. W. E. C. Todd of the Carnegie Museum at Pittsburg, it was sent to Mr. Robert Ridgway of the National Museum at Washington, where both these gentlemen affirmed that it is a Broad Winged Hawk in melanistic plumage

The Building and Function of the College Museum

It is with a keen sense of how far short of the real mark he shall come that the writer aims at the center of this target. It is also with an appreciation of the situation in the average college with regard to meager funds, limited space, lack of appreciation by the authorities as well as the public, and the frequent unpreparedness along museum lines and the overworked condition of the professor of natural sciences

Additional Notes on the Little Spotted Skunk, Spilogale interrupta Raf.

In volume XXII of the Proceedings of the Iowa Academy of Science, it was shown that the Little Spotted Skunk is state wide in its distribution. Since writing the last article, I have received specimens from Muscatine, Iowa, from Mr. J. Greenblatt; also from Mr. Christian Hoeg, of Decorah, Iowa, who states that they seem to be quite common in that vicinity; and also from Sabula, Iowa, at which place Mr. J. C. Day and son had received during the winter of 1915 and 1916, up to the 17th of March, 1916, twenty-five pelts of civet cats, trapped in the immediate vicinity of Sabula

Successful Mink Farming in Iowa

Through the kindness of Prof. C. C. Nutting, Senator Lambert and his brother, Mr. C. Lambert, of Sabula, Iowa, the writer was afforded an opportunity to visit and study the mink farm owned by Mr. C. Lambert and J. E. Densmore, of Sabula, Iowa

The Duck Hawk (Falco peregrinus anatum) in Iowa

Few birds of the United States are more widely and generally distributed, and probably no one species is more isolated as to the individual pairs than the Duck Hawk, (Falco peregrinus anatum)

The Mg/Ca–temperature relationship in brachiopod shells: calibrating a potential palaeoseasonality proxy

Brachiopods are long-lived, long-ranging, extant organisms, of which some groups precipitate a relatively diagenetically stable low magnesium calcite shell. Previous work has suggested that the incorporation of Mg into brachiopod calcite may be controlled by temperature (Brand et al., 2013). Here we build upon this work by using laser ablation sampling to define the intra-shell variations in two modern brachiopod species,Terebratulina retusa (Linnaeus, 1758) and Liothyrella neozelanica (Thomson, 1918). We studied three T. retusa shells collected live from the Firth of Lorne, Scotland, which witnessed annual temperature variations on the order of 7 °C, in addition to four L. neozelanica shells, which were dredged from a water depth transect (168–1488 m) off the north coast of New Zealand. The comparison of intra-shell Mg/Ca profiles with shell δ<sup>18</sup>O confirms a temperature control on brachiopod Mg/Ca and supports the use of brachiopod Mg/Ca as a palaeoseasonality indicator. Our preliminary temperature calibrations are Mg/Ca = 1.76 ± 0.27 e<sup>(0.16 ± 0.03)T</sup>, R<sup>2</sup> = 0.75, for T. retusa and Mg/Ca = 0.49 ± 1.27 e<sup>(0.2 ± 0.11)T</sup>, R<sup>2</sup> = 0.32, for L. neozelanica (errors are 95% confidence intervals)