Abstract: Manufacturing prismatic ophthalmic lenses by setting prism angle at the time of chucking for surface generation. The lens is secured to a block having a spherical edge insertable into a correspondingly internally spherical collet against adjustable stops for setting prism angle. Closing of the collet against the block fixes the lens for surface generation.

Abstract: Improved apparatus for transporting and positioning a contact lens immersed in a liquid for inspection is disclosed. The device has a plurality of supporting surfaces and a weight to biase the lens against the surfaces during immersion and prevent unintentional motion of the lens in the liquid during inspection.

Abstract: An instrument supporting arm is consistently uniformly counterbalanced over its entire excursion of adjustment with springs and spring holder guided by cams which alter arm length-to-moment ratio and force angles to compensate for spring extension forces.

Abstract: Cast resin lenses which are removed from casting molds early in a cure cycle are coated for protection against exposure to oxygen to provide increased post cure surface polymerization and abrasion resistance.

Abstract: Generating lens surfaces to true toric or spherical shapes with lens surfacing machinery employing a dual pivoting system and fixed radius cutter. Lenses are fed across the cutter along a first circular path developing the spherical component of a toric surface while the cutter is simultaneously swept orthogonally across the lens along a second circular path which develops the cylindrical component of the toric surface. Various combinations of spherical and cylindrical curvatures are produced by adjustment of radii of first and second circular paths.

Abstract: Over refraction of an aphakic patient with a temporary lens clipped into an empty eye wire of a spectacles frame to be subsequently permanently glazed and worn by the patient. With the temporary lens set at proper vertex distance from the cornea, centered with the eye and correct face fitting adjustment of the frame, over-refraction is undertaken for determination of permanent lens refractive requirements.

Abstract: Generating lens surfaces to true toric shapes with lens surfacing machinery employing a cutting tool having a single cutting edge and provision for universal adjustment of its effective cutting radius.

Abstract: An improved drive for the deflection coil of a cathode ray tube. A first deflection, low-power supply means drives the deflection coil causing the electron beam to scan the face of the tube. A separate second deflection, high-power supply means drives the deflection coil causing retract of the beam. A switch means including a mono-stable multi-vibrator produces an output pulse of selected duration which controls a transistor switch connecting the second supply means to the deflection coil during the retrace cycle. A source of sync signals connected to the multi-vibrator produces the pulse input signals necessary to drive the multi-vibrator thereby controlling the timing of the transistor switch for causing retrace. The use of a separate second high power supply permits rapid retrace, improved power supply matching and minimal heat loss.

Abstract: A six member microscope objective having a numerical aperture of substantially 0.90 and a magnification of substantially 100x for use without oil is disclosed.

Abstract: Homopolymers and copolymers of compounds according to the formula; ##STR1## wherein R is an alkyl having 1 to 3 carbons, a+b+c+d=e, b=0 to e, c=0 to e, b+c>1, d=0 to 5, e=1 to 100, and Y is an organic group containing at least one >C=C< are hydrophilic as well as exhibiting properties similar to silicone compounds. The polymers are particularly useful in contact lenses having enhanced oxygen permeability.

Abstract: A self-oscillating, high voltage DC power supply for a cathode ray tube drive. Included within the high voltage power supply are an oscillator coil connected to a DC supply and transistor switching means connected to the coil between the coil and ground so as to provide a charging circuit for the oscillator coil. Diode means and output filter are connected between the coil and the DC output to provide a smoothing of the ripple of the DC output. Included in the oscillator power supply are a feedback coil inductively coupled to the oscillator coil and wound in the opposite direction. The feedback coil is a part of a base drive circuit for the transistor switch. Included also are feedback resistance in series with the coil and these elements are connected between the base of the switching transistor and ground.

Abstract: A heart rate analyzer responsive to the R wave of successive ECG complexes of a patient. The intervals between successive ECG complexes are continuously counted and summed for a first number of successive complexes. First electrical representations of the average values of the intervals are generated over the first number of complexes, the number being no greater than two. The second average of the same intervals is generated for a second number of successive numbers of complexes greater than the first and electrical representations thereof are produced. These electrical representations are trapped and at least a maximum value of the first representation and a minimum value of the second representation are held. These maximum and minimum values are then converted to corresponding minimum and maximum heart rates respectively. Lastly each R wave signal generated over a predetermined period of time is counted thereby providing an indication of the average heart rate.

Abstract: An array of optical elements having imaging properties in one meridian and light-containment properties in another meridian for imaging a slit aperture in such a way that inversion of the image occurs across the width of the slit but not along the length of the slit. This one-way image reversal may be used to improve efficiency in photocopying.

Abstract: The preamplifier comprises amplifying means, the output of which is inverted relative to the input, and a feedback circuit connected from the output to the input of the amplifier so as to provide a perfect integrator which cancels the amplitude variations resulting from changes in tape speed. The impedance of the feedback circuit and the impedance of the signal source extended to the amplifier are such that the output of the amplifier is the integral of the voltage generated in the inductive head over a wide band of frequencies.

Abstract: A high efficiency current regulator control circuit used to adjust and accurately control current flow in a substantially resistive load such as the low resistance filament in an electron gun of an electron microscope. The efficiency is obtained by running a solid state device such as a transistor in a switching mode. The present circuit represents an advantage over previous circuits which utilized a series or shunt pass regulator which dissipates power in performing the regulation function. The present circuit utilizes a switching mode regulator which regulates by switching a fast transistor either full "on" or full "off" in response to current flow through a sensing resistor. The ratio of "on" to "off" time determines the current transfer.

Abstract: Gradient refractive index fibers or rods are formed of leachable glass clad glass core preforms drawn to a desired diametral size, bundled together, fused under high compressing forces and rapidly interdiffused at a temperature above their deformation point. Cooling, annealing and separation of the fibers or rods by leaching provides the end product devices which may be cut into lengths required for the lens power desired and end polished. The refractive index gradient is produced by interdiffusion of T1.sup.+ and K.sup.+ ions between core and cladding glasses which are selected to contain substantial proportions of thallium oxide and potassium oxide respectively.

Abstract: Acrylic siloxanes having the formula: ##STR1## where R.sub.1 is selected from the class of hydrogen or methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an integer from zero to one, A is selected from the class of methyl or phenyl groups, R.sub.2 is selected from the class of methyl or phenyl groups, R.sub.3 and R.sub.4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups, act synergistically with vinyl pyrrolidone and hydroxy ethyl methacrylate to provide optically clear moderate water containing contact lenses of substantially increased oxygen permeability.

Abstract: A two piece disposable blood chamber having registration means and a locking clip to prevent disassembly for sterilization is disclosed.