Abstract: A combination of a microcolumn packed with a suitable absorbent material and a centrifuge tube. A predetermined volume of an eluent being capable of selectively eluting a desired substance through the microcolumn is contained above the packing of the absorbent material. The microcolumn and the centrifuge tube are dimensioned in such a manner that upon centrifugation of the predetermined volume of the eluent through the microcolumn, a level of the eluent remaining in the microcolumn, and a level of the eluent in the centrifuge tube coincide substantially at or above a top surface of the packing of the absorbent material. Consequently, centrifugation of the assembly of the microcolumn and the centrifuge tube causes passage of the predetermined volume of eluent through the microcolumn. Determination or assay of the selectively eluted desired substance may be performed by spectrophotometric methods.

Abstract: A circuit for dejittering transmitted digital data. A buffer stores the incoming data and has its half-full condition monitored by content decoding circuitry including a counter whose count is converted to control the frequency of a voltage controlled oscillator. The oscillator clocks the data out of the buffer effectively free of harmful jitter.

Abstract: Circuitry for automatically and dynamically reconfiguring the channel or port configuration of a modem handling a plurality of ports. A standard signal such as DTR (data terminal ready) is used to provide a code to a master modem indicating the particular port configuration requested by cooperating apparatus. The requested configuration code is continuously compared to a code stored by a shift register controlling the actual modem port configuration. When the requested code changes, an indication of the code change is transmitted to a communicating slave modem and a control signal is sent, after a suitable delay, to the shift register to conform its contents to the newly requested configuration code. During the delay, the slave modem switches to the newly requested configuration. The circuitry follows a defined sequence of configuration switching, dropping channels successively and adding channels by passing through the state where all channels are active.

Abstract: A delay line time compression correlation circuit for correlating two sets of serial data is disclosed, and includes a counter for defining the number of data pairs that have been correlated and the amount of time shift between the two sets of serial data. The two sets of serial data are digital samples of two clipped analog input signals which are simultaneously sampled as a function of the correlation count value. The samples are stored and serially cross-correlated with predetermined time displacements between the two sets of data. The correlation results for each particular time displacement are summed with such total being provided as an output while the correlation for the subsequent time displacement takes place.

Abstract: An electro-optical medical instrument is provided for measuring the presence of bilirubin in skin tissue. The instrument is preferably hand-held and self-contained and utilizes a source of flash light to provide sufficient energy in the desired wavelength spectrums. The medical instrument can be automatically activated at a predetermined pressure against a patient's skin to provide a pair of measurement electrical signals. These electrical signals can be processed to provide an output signal representative of the bilirubin value which can be conveniently displayed.

Abstract: An improved eye fundus camera for photographing the fundus of a patient's eye is disclosed. Three separate energy sources are provided which include a first source of a visible light wave length for illuminating the fundus during photography, a second source including at least a first infrared wavelength band for illuminating the cornea of the patient's eye for alignment of the pupil on the optical axis, and a third source including at least a second infrared wavelength band for illuminating the fundus of the patient's eye for focusing the camera on the fundus. A wavelength selective filter is provided on the optical axis having a predetermined aperature. At least one of the infrared light source wavelengths can be transmitted through the filter to provide a full image of the cornea of the patient's eye for alignment purposes.

Abstract: A digital oximeter for noninvasively measuring oxygen saturation of the arterial blood is provided. Photoelectric transducers measure the light intensity after passing through living tissue to produce at least a pair of output signals of different wavelengths of light. A sample hold circuit is provided for correspondingly storing each of the respective output signals. A microprocessor controlled pulse activates a subsequent subtraction step between a second measurement taken for each of the respective wavelengths to correspondingly produce at least a first and second subtraction output. The circuit can then process at least the first and second stored light outputs and the first and second subtraction outputs to indicate the oxygen saturation.

Abstract: An optical adaptor is provided to permit objective lenses designated for a certain image format to be used on optical devices having a smaller image format. Thus, 35 mm single lens reflex camera lenses can be mounted on a cinematographic camera and a T.V. camera. The optical adaptor includes a pair of mounts for attachment respectively to the objective lens and to the optical device. Mounted within the adaptor housing is a positive refractive lens system capable of shortening the focal length and increasing the aperture ratio of the objective lens system. The lens system satisfies the condition that the magnification, .beta., is equal to or less than 1 and the refractive power of a negative element lens .PSI..sub.1 to that of a positive element lens, .PSI..sub.2, in the lens system, satisfies the following;(4/.beta.)-4.5.ltoreq..vertline..PSI..sub.2 /.PSI..sub.1 .vertline..ltoreq.(4/.beta.

Abstract: A compact catadioptric lens system with a widened field angle is disclosed and characterized in that the axial distance L between the main-mirror element (M.sub.1) and the sub-mirror element (M.sub.2) fulfills the following condition in relation to the diagonal length D of the rectangular focal plane on which the image is projected:1.5D>L>0.5D ,and that the radius of curvature R.sub.5 of the image side surface of the sub-mirror element and the radius of curvature R.sub.

Abstract: A toy figure configured in the shape of a person or animal and capable of effectively simulating a roller skating motion, is disclosed. The toy figure incorporates a chassis having a source of rotary motion such as a spring powered motor. A pair of substantially upright support members are mounted to the chassis and effectively simulate leg and foot portions of a person or of an animal. The support members are capable of a pendulum like oscillating motion relative to the chassis. A mechanism is operatively connected with the motor to move the support members in said oscillating motion.Each support member incorporates at least one roller or wheel which is continuously driven by the motor through a suitable gear train and pulley and belt assembly or the like. The continuous rotation of the rollers or wheels and the simultaneous pendulum like oscillating motion of the support members propels the toy figure along a support surface in effective simulation of a roller skating or like motion.

Abstract: A plurality of fingerprints of a person are recorded by applying a solution of a first substantially colorless chemical reagent to the fingertips. Essentially invisible fingerprints are obtained by gently pressing the fingers having the solution of the first chemical reagent thereon on a suitable recording sheet. Subsequently the recording sheet is exposed to sublimed vapors of a second chemical reagent. The first and second chemical reagents are selected to react with one another to yield a highly colored substance which is formed on the surface of the recording sheet providing a visible image of the fingerprints. Ferric chloride and a 8-hydroxyquinoline are ideally suited chemical reagents for use in this invention. An apparatus of unitary construction incorporating a replaceable dispensing pad having the solution of the first chemical, is disclosed.

Abstract: A circuit for maintaining proper sampling timing in a data modem wherein main channel equalizer error is correlated with a derivative channel signal to drive a clock correction signal. The derivative channel signal is derived from an equalizer using fewer coefficients than required to derive the main channel equalized signal, and calculation of the equalized derivative and clock correction signal is performed only once every other Baud.

Abstract: The present invention is directed to an improved powder press assembly of the withdrawal die type that is capable of subjecting the frame and die set to only compressive forces while accurately maintaining the dimensions of a compacted part. Mechanical stops are provided in upper and lower ram assemblies and cooperate with a multifunction push rod assembly to provide bilateral press position. The high and low pressure hydraulic system provides an economical use of the power requirements and further includes a bypass valve in a main pressure cylinder to accommodate rapid movement of the upper ram assembly.

Abstract: The inverted telephoto type wide angle lens system of the present invention includes, from the object to image side, a first lens group having a positive single lens, a first negative meniscus single lens convex to the object side and a second negative meniscus single lens convex to the object side. A second lens group includes at least one positive lens while a third lens group includes, from the object to the image side, a first positive meniscus single lens convex to the image side, a biconcave single lens, a second positive single lens convex to the image side and a positive single lens. In addition, the inverted telephoto type wide angle lens system of the present invention fulfills the following conditions:______________________________________ 0.75f < .vertline.f.sub.1,2,3 .vertline. < 1.25f f.sub.1,2,3 < 0 10f< f.sub.1 < 20f 6.5f < .vertline.r.sub.2 .vertline. < 22f r.sub.2 < 0 1.3f < f.sub.5 < 1.9f ______________________________________wherein:f.sub.

Abstract: A catadioptric light system such as a module lens system capable of being mounted on a camera is provided. A plurality of light reflecting and refracting optic members are designed to provide a desired image forming light path through the lens system. Disposed within the lens system is an electrochromic device that is responsive to an applied voltage to provide a predetermined degree of light transmission intensity through the lens system. The electrochromic device can be a thin film mounted on a transparent plate or on a reflective surface. The housing of the lens system can be advantageously designed to contain its own power source.

Abstract: An improved high speed fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/2.8. The fish eye lens system includes a first lens group of a negative refractive power having two negative meniscus single lenses convex to the object side. A second lens group of a positive refractive power includes a doublet, while a third lens group of a positive refractive power includes at least a positive meniscus single lens convex to the image side and a doublet.

Abstract: In a light measuring optical system for use in measurement of pulse waves in the artery at the eye fundus or oxygen saturation in the artery blood at the eye fundus, light for illuminating the eye fundus is converged on the surface of the cornea of the eye to be measured and enters the interior of the eye through a small area within the pupil. Light reflected at the surface of the cornea is converged and blocked at its converging position while the light reflected from the eye fundus is allowed to pass by the light blocking member and reach a photocell. Coupled with the photocell is an electric circuit which transmits AC component of photocell output when DC component of the same assumes its minimum value.

Abstract: A composite photography system of a registered matte type having foreground and background camera optical systems is provided. The respective images from each camera optical system are maintained in registration whereby objects in the background scene can be viewed by one camera and objects in a foreground scene can be viewed by the other camera to produce a realistic composite image. The optical systems permit the maintenance of a substantially constant magnification ratio of image to object during a variable focussing of at least one of the foreground and background optical systems. Additionally, substantially stationary entrance pupil positions are maintained during the focussing mode of operation. The background lens system is, by itself particularly adapted for incorporation into optical scanning probes such as simulators to provide a minimum altitude and constant image magnification during focussing.

Abstract: A toy having an upper and a lower body section is disclosed. The lower body section is operatively attachable to the upper body section in a plurality of configurations. A container capable of holding a liquid is included in the upper body section. A compressable bellow, and a nozzle is operatively connected to the container whereby the liquid may be squirted out from the toy at the option of a player. The lower body section includes an electric motor and a track assembly which is capable of locomoting the toy in any of the possible configurations assembled at the option of the player.