Apparatus for measuring the volume and specific gravity of fluids and including inner and outer generally concentric compartments arranged in such a manner that relatively small quantities of fluid can be measured with a high degree of accuracy.

A variable ratio device for producing specific non-linear motion. This device includes primarily, an internally toothed housing in which is rotatable, by shaft means, a pair of gears supported upon pillow blocks, the pillow blocks having a gear with an offset pin, the offset pin carrying a rod which extends from out of the housing.

Apparatus useful in the determination of specific gravity of a test liquid by the falling-drop method is described. The apparatus provides an overflow feature wherein the test liquid which is dropped down a fluid column for specific gravity determination subsequently flows up a second column to a drain. This feature enables the initial fluid column to be conveniently repetitively used for specific gravity determinations.

Method and apparatus for measuring the specific surface of pulverized materials successively feeding a predetermined weight of pulverized material to a transparent container. The material is then compacted into a predetermined volume and air passed therethrough, the air being increased from an initial pressure to a predetermined increased pressure. The pressure is then allowed to decrease to its initial position and the time taken is measured against a fixed reference. The process is cyclically ...

A specific gravity meter for measuring an unknown gas against a known gas such as helium. There are equal height columns of the gases with pressure transducers located at the tops and bottoms of the columns. The transducers measure the pressure differentials between columns at the vertically spaced location, and there is an electrical system for determining the difference between those pressure differentials. The difference determination may be calibrated in terms of specific gravity of the unkn...

A self contained, specific wavelength, single beam colorimeter for direct spectrophotometric measurement of the concentration of a given solute in a test sample. An electrical circuit employing a photoconductive cell converts the optical output into a linear, directly readable meter output. The colorimeter is simple to operate and is adapted for use in zero gravity conditions. In a specific application, the colorimeter is designed to analyze the concentration of iodine (I.sub.2) in potable water...

Wedge-type vanes, or vanes with increasing thickness from inlet to exit facilitate the layout of aerodynamically favorable flow channels in application to small diameter low specific speed compressor wheels. The channels may have various cross sections including rectangular, square, oval or circular. The channels may be backwardly bent, straight, or s-shaped in form. Streamlining the pressure side of the vanes at the exit helps to reduce exit wake losses. A local restriction may be provided in t...

A potassium ion-specific membrane includes a hydrophobic elastomeric polymer with a dielectric constant of from 4 to 13, and a potassium ion-specific carrier. The hydrophobic elastomeric polymer is preferably an organopolysiloxane polycarbonate block copolymer. The potassium ion-specific carrier is selected from the group consisting of nonactin, gramicidins, valinomycin, and mixtures thereof.

The present invention is directed to a system and method which allows a user to easily find a desired community or discussion category that pertains to a topic of interest to the user. A preferred embodiment of the invention involves a hierarchical structure for a plurality of communities and a matching engine that essentially only searches the plurality of communities. It is preferable to allow any user to extend the structure by adding new keywords and links and new communities by indexing exi...

A purified highly specific tuberculin, substantially free of protein, useful in the diagnosis of tuberculosis in humans and a process for preparing said tuberculin. Unlike known tuberculins, the aforesaid tuberculin is capable of being used to distinguish between tuberculosis-infected individuals and other individuals such as BCG-vaccinated individuals, and individuals infected with atypical mycobacteria of Runyon Groups I, II, III and IV. The average molecular weight of the purified highly spec...