Plane Window Research Articles

A Wide-Angle, Underwater Camera Lens*

An underwater camera lens covering a half-field of 37.5° is described. The area imaged with this lens is more than seven times that covered with the customary arrangement of a conventional camera lens behind a plane window.

A New Source for Raman Spectroscopy

A new source for Raman Spectroscopy consists of a straight glass tube holding 6 ml., with a plane window, and illuminated by four mercury-discharge lamps. It is intended for industrial use.

The Ultra-Violet Absorption Spectrum of Carbon Suboxide Gas

The carbon suboxide used in this investigation was prepared by the diacetyl tartaric anhydride method (1), and was kindly supplied by Dr. W. E. Vaughn of this laboratory. The material was purified by four vacuum distillations and may have contained a trace of acetic acid as impurity which, however, would not have been disturbing in the region investigated. The carbon suboxide gas was contained in a quartz absorption cell 15 cm. in length, provided with plane windows and a side arm containing an excess of the material in liquid form. By controlling the temperature of the latter the gas pressure in the cell could be regulated. The absorption cell itself was kept at room temperature, which was about 21°C. The carbon suboxide apparently kept well if sealed in perfectly clean quartz vessels, especially if maintained at low temperatures, but after long exposure to ultra-violet radiation a white deposit collected on the windows of the cell. This was probably a polymerized form of the suboxide and it quickly changed over to a reddish orange form if gently heated.

Eosin-Light Injury of Erythrocytes. 1. The Influence of Certain Ions.

To investigate the problem of photo sensitization in pellagrins, need has been felt for quantitative in vitro methods. The observations here described were made with the hope of aiding in the development of such methods.As a sensitizing agent yellow eosin (National Analine and Chemical Company) has been used. The light source was a nitrogen-filled tungsten filament lamp of 1500 watts, operated at 115 volts by alternating current. The suspension of erythrocytes was contained throughout exposure to light and measurement of degree of hemolysis in standard Pyrex test tubes of 16 mm. outside diameter with walls 1.5 mm. thick. Equal exposure of each tube was insured by placing the tubes in a device to be described in detail elsewhere. This apparatus moved tubes in a circle 30 cm. in diameter about the light source at the approximate center, while the tubes were immersed in a constant temperature waterbath at 37.5° C. and received light through plane windows of plate glass 3 mm. thick. The layer of tap water bet...