Abstract: A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode pair selecting means is included in a portable head box which may be placed adjacent to the patient to be tested. Included in the head box are facilities for testing the impedance of any selected one of the patient electrodes and providing a visual indication of the magnitude of such impedance. The head box also includes facilities for selecting a group of patient electrodes which are connected together and used as an average or reference potential for one input of the common signal path. Facilities are also provided for calibrating the common signal path by applying a d.c. calibration signal to the input thereof by means isolated from system ground.

Abstract: A multi-channel instrumentation system is provided wherein signals from selected electrode pairs are sequentially connected to the isolated input of a common signal amplifying path. The electrode pair selecting means is included in a portable head box which may be placed adjacent to the patient to be tested. Included in the head box are facilities for testing the impedance of any selected one of the patient electrodes and providing a visual indication of the magnitude of such impedance. The head box also includes facilities for selecting a group of patient electrodes which are connected together and used as an average or reference potential for one input of the common signal path. Facilities are also provided for calibrating the common signal path by applying a d.c. calibration signal to the input thereof by means isolated from sytem ground.

Abstract: An apparatus and method to isolate faults in a catalytic converter equipped internal combustion engine.The exhaust is analyzed to determine hydrocarbon content, carbon monoxide content and oxygen content and this data is processed through an electronic circuit which accumulates information to be disclosed at the termination of testing.

Abstract: An apparatus and method for determining fuel burning efficiency in articles which require hydrocarbon combustion for operation, such as noncatalytic converter equipped internal combustion engines, hot water heaters, furnaces and the like.The invention includes a three gas analyzer which measures the amount of carbon monoxide, oxygen and hydrocarbon in the emissions of the exhaust system.

Abstract: The present invention is an accessory useful in servicing capillary tube type ink pens associated with strip chart recorders and the like. The device can be used to insert an air bubble into the metallic capillary tube pen during periods of nonuse, flush the pen with solvent when necessary, and prime the pen with ink from an ink supply. The device comprises a container for holding a quantity of ink solvent and having an air pump means such as a bellows communicating with the area above the liquid in the container whereby pressure or vacuum can be applied to the interior of the container. A base member communicates with the liquid in the interior of the container and has an extended tube contained therein terminating at the opposite end in an opening containing a bushing designed to snugly mate with the tip of the recorder pen to provide an airtight/watertight seal.

Abstract: The present invention pertains to a method for setting the side to side balance of a multi-barreled carburetor on an automobile engine which is running smoothly with no misfiring cylinders and which is set to factory specifications for curb idle speed and timing.

Abstract: A washable non-splatter ink for use in oscillographic type pen recorders is disclosed. The ink is characterized by being stable at room temperature for extended periods of time, thus not requiring refrigeration for the maintenance of stability. The ink contains a high molecular weight polyacrylamide rather than polyethylene oxide as a pituity agent to stop splatter of the ink at fast writing speeds. The polyacrylamide allows the use of washable acid dyes. The inclusion of an unsaturated alcohol, such as butyne diol acts to retard the oxidation of the pituity, thus stabilizing the pituity against aging degradation.

Abstract: A kinetic assay is provided for determining the acid phosphatase in an aqueous solution by measuring the amount of of reduced coenzyme produced. The assay is based on the following coupled reactions:I. organic phosphate .sup.acid phosphatase PO.sub.4.sup.-3 +organic alcoholII. maltose+PO.sub.4.sup.-3 maltose phosphorylase glucose+ .beta.-D-glucose-1-phosphate;III. .beta.-D-glucose-1-phosphate .beta.-D-phosphoglucomutase glucose-6-phosphate;IV. glucose-6-phosphate+NAD glucose-6-phosphate dehydrogenase NADH+6-phosphogluconate.

Abstract: An improved multi-channel galvanometer assembly is disclosed particularly well adapted for use in such instruments as electroencephalographs and the like. The assembly includes a soft steel combination return path structure and frame supporting a plurality of galvanometer movements. The design employs pairs of samarium cobalt magnets held in place adjacent and on opposite sides of the coil of each galvanometer by magnetic attraction to the steel return path structure. The galvanometers themselves are each mounted on an aluminum support plate which also serves as a shield to prevent magnetic coupling between adjacent galvanometer coils when the galvanometers are assembled in the support frame. The galvanometers on their support plates are each individually removable and/or replaceable. The result is a lighter, smaller, multi-channel galvanometer assembly which is readily expandable and easily serviced.

Abstract: Method and apparatus for improved detection of sulfur dioxide by fluorescence are disclosed wherein the effects of interferent hydrocarbons in the test sample are eliminated. In apparatus detecting sulfur dioxide by detecting the fluorescence of sulfur dioxide from narrow band ultraviolet radiation by photomultiplier means, the test sample being fed to the fluorescence chamber is first passed through a reactor to oxidize the hydrocarbons from the sample. The effect of this oxidization is to convert interfering hydrocarbon components in the sample gas into non-interfering materials. In one embodiment employing ozone, moisture removal apparatus is added prior to the oxidization reaction to prevent the error producing formation of H.sub.2 SO.sub.4.

Abstract: A solid state simulator of an automobile ignition system is disclosed whereby an automotive engine scope tester can be tested and calibrated. Pulse rate logic is made responsive to means for selecting the number of cylinders and the revolutions per minute of the simulated engine. Variable pulse generation means is made responsive to the pulse rate logic. The output of the pulse generation means is used to trigger a driver connected to a conventional coil and single spark plug simulating the firing of all the spark plugs in the engine. Additionally, the output of the pulse generation means is divided and used to drive an adjustable delay which in turn triggers a one shot high voltage pulse to simulate the firing of the spark plug associated with the number one cylinder. Signal output terminals are provided at the input to the coil to indicate the time of each firing signal and allow feedback control by the engine scope tester.

Abstract: A reactor for removing contaminants such as reactive hydrocarbons from the gas being sampled by gas component determination apparatus is disclosed. A confined path is disposed adjacent a high purity quartz lamp capable of generating low order wavelengths. By selecting the flow rate of the sample gas past the quartz lamp in the presence of ozone, all hydrocarbons can be photo-oxidized or all hydrocarbons with the exception of methane. Apparatus is also disclosed employing the reactor wherein the methane content of a sample gas can be determined. The sample gas is alternately measured as to the quantity of all hydrocarbons contained therein and then measured for methane. The difference between the two readings is indicative of the amount of non-methane hydrocarbons present.

Abstract: Method and apparatus is disclosed for calibrating a timing light used in conjunction with an engine scope tester. The timing light is fired by an offset circuit in an engine scope tester having a meter indicating the offset amount. The engine scope tester is synchronized to the firing of a simulated No. 1 cylinder spark plug. The light from the timing light is detected by a phototransistor connected to a voltage reference source which amplifies the signal from the phototransistor to a usable level. The output of the voltage reference source is connected back to a vertical deflection circuit of the oscilloscope on the engine scope tester. The calibration marks on the oscilloscope of the engine scope tester are used to calibrate the meter on the engine scope tester indicating the offset to the timing light.

Abstract: An electrochemical detection cell particularly suited for portable applications because of its small size and low cost. An enclosure is provided having two membrane surfaces. Electrodes are suspended internally between the two membranes supported by an electrochemically inert hydrophilic material containing an electrolyte solution. An improved electrode structure for use within the cell is disclosed.

Abstract: A pressure transducer and method of manufacture is disclosed wherein a tantalum diaphragm is held in position in a pressure transducer by sandwiching the tantalum diaphragm between a stainless steel weld ring and the stainless steel body of the pressure transducer. The stainless steel weld ring is welded to the stainless steel body at a temperature above the melting point of the stainless steel but below the melting point of the tantalum whereby simultaneous to the welding of the weld ring to the body, a braze is created between the tantalum diaphragm and both the stainless steel weld ring and stainless steel body. This braze creates the required hermetic seal between the tantalum diaphragm and the stainless steel body. Additionally, an inert seal is provided between the pressure body of the transducer and the tantalum diaphragm disposed interior of the inner circumference of the stainless steel weld ring whereby process fluids which would otherwise erode the weld ring are isolated therefrom.