Abstract: The subject of the invention is a pipette with an adjustable volume, wherein an upper stop bushing provided with inside threading is arranged around the piston shaft of the pipette in corresponding threading formed around said piston shaft. When the press button is turned, the upper stop bushing that determines the top position of the piston can be moved by means of the thread joint up and down in relation to the piston shaft so as to adjust the volume of the pipette. In the frame casing of the pipette, along the side, a longitudinal slit passing through the frame casing and provided with a scale is arranged. At the bottom end of the piston shaft, an expansion part is arranged or formed into which a ball is fitted in a bore,, said ball being pressed outwards by a spring.

Abstract: There is disclosed a prosthesis comprising a prosthetic element and a polymethylmethacrylate film fixedly adhered thereto. The prosthesis comprises a surface adapted to be fixedly attached to bone and bears a polymethylmethacrylate film upon the attachment surface. The polymethylmethacrylate film is adhered to the prosthetic element by a process which comprises treating the prosthetic element surface to eliminate any weak boundary layer, applying polymethylmethacrylate to the treated surface, and thereafter annealing the polymethylmethacrylate film.

Abstract: Improved bone connective prostheses are disclosed. The prostheses comprise a reinforcement element carrying a polymer layer having a varying modulus of elasticity. The exterior surface of the polymer layer constitutes the bone attachment surface of the prostheses and has the lowest modulus of elasticity. The interior surface of the polymer layer is attached to reinforcement element and has the highest modulus of elasticity. Portions of the polymer layer lying between the exterior and the interior surface of the polymer layer have moduli of elasticity which are intermediate with respect to the moduli of elasticity of the exterior and interior surface of the layer. The modulus of elasticity of the layer decreases in the direction of interior to exterior. The decrease in modulus of elasticity may be either continuous or incremental. The reinforcement element may have either a simple or a complex structure.

Abstract: An apparatus (10,50) is provided for physically retaining a reagent (17) in a blood collection tube (11) separate from a blood sample until the tube (11) is centrifuged. The apparatus includes a cup-shaped flexible barrier (10,50) placed over the reagent (17) disposed in the bottom of the tube (11). The barrier (10,50) seals with the inner wall of the tube (11) and prevents the reagent (17) from entering the tube's upper evacuated chamber (12,55) into which the blood sample is drawn. The seal maintains the barrier (10,50) in position until the tube (11) is centrifuged whereupon the barrier (10,50) moves to the bottom of the tube (11) causing the reagent (17) to flow past the barrier (10,50) to mix with the blood sample.

Abstract: A fluid, for example, blood, specimen holder for biological testing comprises an elongate transparent tube of equilateral triangle cross section. The intersection region of two sides of the tube forms a channel for controlling, channelling, and concentrating flow of a fluid specimen as the tube is agitated to flow the fluid specimen back and forth between ends of the tube during biological fluid testing. The third side of the tube opposite the fluid flow channel provides a flat impinging surface for a light source used in determining translucency characteristics. A removable end cap for the tube is formed having a small diameter inner portion which projects into the tube when the cap is installed thereon. A transverse diaphragm provided at the inner end of the inner portion enables the cap to be penetrated by a hypodermic needle for introducing a fluid specimen into the tube. The projecting inner portion is configured for preventing escape of fluid from the tube during biological testing.

Abstract: A chemical oxygen generator which is operable by movement of a starter member or thrust member comprises an outer closed container having an end wall on the interior of which an ignition actuation liquid container is mounted. The ignition actuation liquid container is made of a foil material and it is mounted over an ignition mixture container having an ignition mixture which when mixed with the liquid ignites so as to ignite a spark plug for the oxygen generator material.

Abstract: A gas generator construction particularly for the inflation of inflatable protective bags which are used in safety systems of vehicles comprises a housing with a central tubular housing part which contains an ignition device that is surrounded by a reaction chamber containing a gas generating charge which in turn is surrounded by an outer filter housing. The gases which are generated in the reaction chamber are directed through openings and into the filter housing and then outwardly through slots of the filter housing for use in expanding the protective bag. The reaction chamber and the filter chamber are formed by an annular substantially S-shaped wall member which has a bottom forming wall portion for the reaction chamber which is joined to the central tubular part, for example, by welding.

Abstract: A cartridge for respirators for purifying expiratory air contains a chemical arranged in layers separated by partitions which are connected to a perforated central tube. The partition cooperates with a member spaced from a wall of the cartridge and a guide element disposed on the partition to provide alternate passage of the air into the layers.

Abstract: A method of determining the alcohol content of air exhaled by a person using a flow through testing tube having an alcohol indicating material therein and a sampling tube to which the air is directed which has a material therein for retaining the alcohol of the breathing air and also using a suction pump comprises cooling the sampling tube, passing the exhaled air through the cooled sampling tube, measuring a volume of the air passing through the cooled sampling tube, heating the sampling tube and connecting the suction pump to the sampling tube to suck flushing air through the heated tube and then through the testing tube. The sampling tube advantageously contains a silica gel to retain the alcohol therein. The volume measuring device may be a measuring bag.

Abstract: An air-sampling cartridge is disclosed for collecting organic compounds such as N-nitrosamines from air for analysis. The cartridge is formed by joining two injection-molded plastic parts: a generally cylindrical cartridge body into which air-pervious packings of granular adsorbent materials may be loaded, and a cartridge cap which is ultrasonically welded to the body to partially close one end of the cartridge. The cap and body define a cartridge with an inlet and outlet shaped to facilitate connection of the cartridge to a pump used to draw air samples through the cartridge, to allow connection of two or more cartridges in series, and to accommodate standard-sized syringes used in removing trapped compounds from the cartridge for analysis.The cartridge also includes a retention clip integrally molded with the cartridge body and cap for permitting the cartridge to be attached to the clothing of a person during air-sampling.

Abstract: A settler-soaking apparatus for treating the effluent from an acid-catalyzed alkylation reaction is disclosed which comprises three interconnected vertically aligned chambers. The uppermost chamber possesses a hydrocarbon outlet means above an acid hydrocarbon inlet means and a downspout having an acid transfer means extending through and ending in the lower end of the middlemost chamber. The latter possesses a hydrocarbon outlet means at an elevated position with respect to the end of the acid transfer means in the downspout and a lower situated acid outlet means. The lowermost chamber possesses a multitude of spaced horizontal perforate trays and an acid hydrocarbon inlet means, which is in connection with the hydrocarbon outlet means of the uppermost chamber. The middle and lowermost chamber are in open communication via a chimney which extends upwardly into said middle chamber to provide a hydrocarbon outlet means at a point above the end of said downspout.

Abstract: A solution handling device is disclosed which employs flow injection to maximize sampling rate with minimum reagent volume required per sample. The device employs two sample loops and a pair of solenoid actuated four-way valves for controlling flow through the loops. While a first loop receives electrolyte, a second loop, having previously received a sample, is channeled to an analyzer for a specified purpose. Subsequently, the valve operation is reversed so that operation is substantially continuous.

Abstract: The present sampling system provides a means for continuous vapor phase analysis of an indefinite number of process streams in a single operation. The process being sampled is connected into a single analyzing instrument by more than one delivery conduit. Each delivery conduit is heated between the process and the analyzer to a temperature sufficient to maintain the selected sample in its vapor state. During the sampling only one delivery conduit is carrying the sample into the analyzer. At the same time, a purge fluid is being backflushed into the process through each remaining delivery conduit. The backflushing sequence clears out polymerizable materials or other substances which tend to collect inside the conduit.

Abstract: A method of testing air for measuring the chromate and chromic acid aerosols therein, comprises, passing the air through a testing tube after each end of the tube has been broken to cause the particles in the air to become entrained on a filter in the tube and, thereafter, breaking an ampoule of sulfuric acid in the tube so that it flows through the filter and dissolves the entrained particles and brings them into contact with a filling material which is also arranged in the tube and which produces a reaction with the particles of chromate and chromic acid which are deposited on the filter. The reaction produces a violet dye, the intensity of the discoloration being directly proportional to the mass of the deposited chromate or chromic acid.

Abstract: Infrared absorption gas analyzer systems are provided with cells containing sulfur hexafluoride SF.sub.6 for determining the water vapor content of the gas to be measured. In another embodiment, sulfur hexafluoride is used as a selective filter for removing spectral components from a beam of infrared energy so as to prevent cross sensitivity which interferes with the measurement of other gas components. Electrical signals proportional to the water vapor content may be produced by measuring the increase in gas pressure as infrared energy is absorbed, by use of a diaphragm capacitors. In another embodiment, temperature responsive resistors measure the relative attenuation of the infrared energy as it propagates through respective gas components.

Abstract: Plaques for rapid retrospective recognition of an overdose of noxious gases are of great importance for industrial protection in the chemical industry. These plaques carry an indicator which undergoes a color change on exposure to the gas. Visual assessment of the indicator is considerably facilitated by subdivision of the indicator surface into a plurality of measuring fields with graded sensitivity by means of different covering membranes. Rapid allocation to a given range of dose is possible by separate or combined visual observation of the individual fields of the indicator.

Abstract: This device for measuring a physical operating characteristic of an ozonizer such as, for example, the ozonization power, the production of ozone or the concentration of ozone in the air, comprises a medium or high-frequency sensor placed in the ozonization zone of the ozonizer and an electronic processing circuit which delivers a signal which is an image of the energy received by the sensor. The sensor detects the medium or high-frequency energy produced in the ozonizer and produces a signal which is an image of one of the aforementioned physical characteristics owing to the fact that the curves of these characteristics are colinear with those of the medium and high-frequency energy components.

Abstract: Toilet deodorant holder comprising an elongated open basket to receive the deodorant or replacement deodorant having a plastic suspension bracket produced by integral deformation of the plastic with the basket and engaging over and beyond the mouth as the basket. The present arrangement makes it possible to simplify the production and use of the holder and to refill the basket automatically with deodorant as required.

Abstract: The subject of the present invention is a transfer device for analysis equipment, which transfer device comprises a track consisting of, inter alia, guide and support rails on which to transfer a pit plate on a transport cassette along the track. The transport cassette includes a traction rail parallel to the guide and support rails. Traction units are fitted onto the track in the transfer device as means operative jointly with said traction rail to move the transport cassette. In order to control the operation of the traction units, the traction rail is provided with sign codes readable by means of an optical reading device. This indicates the position of the cassette relative to the optical reading device so that the transport cassette may be stopped to position the desired line of pits, transverse to the track for operations to be performed in the analysis equipment, such as liquid dosage, photometric measurement operations, etc.

Abstract: A toxic-monitoring material for the detecting and monitoring of toxic fluids placed in contact with or exposed to the monitoring material, which material comprises a solid, microporous, transparent, polymeric, matrix material having interconnecting micropores filled with a liquid composition, the liquid composition comprising a solvent for the toxic component to be detected and a reactant which reacts with the toxic component, whereby a toxic component dissolves in the solvent within the micropores and reacts with the reactant, to produce a change in color or appearance throughout the depth of the material, so that the detecting and monitoring of the toxic fluid may be determined.