Abstract: The subject invention is an air cooled ice rink construction in which the means for cooling the slab of the ice rink is separated from the ground under the slab by a region accessible to air external to the ice rink enclosure. The means for cooling the slab of the ice rink may be a circulating flow of mechanically-cooled air or, if the air external to the ice rink enclosure is sufficiently cool, it may be a circulating flow of such external air. The ice rinks constructed according to the subject invention may be operated at significantly lower operating costs than conventional ice rinks.

Abstract: A housing for an intraocular lens having opposed walls and having a lens in at least one of these walls which is the same in magnitude and opposite in sign to the optical power of the lens intended to be housed therein. The housing bears indicia of the optical magnitude and sign of the lens intended to be housed therein. A surgeon can ascertain whether the intended lens is in the housing by viewing an object through the housing walls and through the lens housed therein. There will be substantially no optical distortion if the intended lens is in the housing.

Abstract: A hand-held surgical instrument for fragmentation and removal of animal tissue such as a cataract has a working tip which in addition to being longitudinally vibrated is laterally oscillated to enhance the operation thereof. Also, the method of laterally oscillating the working tip in the range of about 5 degrees to about 60 degrees, longitudinally vibrating the tip ultrasonically, supplying treatment fluid to the region adjacent to the working tip and withdrawing the suspended particles of the cataract in the fluid.

Abstract: A muffler comprises two Helmholtz resonators, one tuned for high frequency and the other for low frequency. There is a resonance of the high frequency resonator volume's compliance and the effective tail pipe gas inertance which produces an undesirable low frequency noise. This is matched by the resonant frequency of the low frequency resonator, and suppressed thereby. A secondary effect to suppress noise at frequencies above said low frequency resonance due to the tailpipe gas inertance increasing linearly with frequency.

Abstract: A method and apparatus for forming a sliver from a web of fibres leaving the upper part of a horizontally extending delivery roller (2) of a cotton type carding machine. The web is delivered downwardly from the upper part of the delivery roller into proximity with a surface of power driven selvedge support means, in one embodiment conveyors (9 and 10). The surface of the selvedge support means moves at a level below the upper part of the delivery roller in a direction that is generally longitudinal to the delivery roller and into a sliver-forming nip (15). The downwardly travelling web passes through the nip and tension is applied to the web by the action of the nip. The sliver is delivered from the nip (15) and may pass directly to calender rolls (27) immediately downstream of the nip. If parts of the web should break, the selvedge support means will guide these back into the nip to regain normal running.

Abstract: A carding engine having a rotatable hollow carding cylinder (5). The inner surface of the cylinder is formed with a fluid-conveying pathway (18 to 21) in a pattern such that fluid circulated through the pathway will maintain the surface temperature of the cylinder substantially uniform. Means are provided for circulating fluid through the pathway in such a way that during operation the pathway is maintained full of fluid.

Abstract: A posterior chamber intraocular lens having at least two projections on the rear surface thereof for causing a line of tension in the posterior capsule. If desired, after implantation of the lens the posterior capsule may be perforated with a laser beam transversely to the line of tension, causing the posterior capsule to tear and form an opening to eliminate any cloudiness of the posterior capsule from behind the central region of the lens.

Abstract: High voltage electrical switchgear comprises a chamber (1) in which is enclosed input contacts (8), output contacts (24) and earth contacts (16). A movable switch (12) may connect either the input to the output contacts or the output to the earth contacts. The output contacts are connected by a conductor (25) extending through the wall of the chamber to a connector unit located externally of the chamber. The connector unit (27) has a conductor (32) moulded in situ in a housing (28) having a socket (30) receiving a plug (26) cast integrally with the chamber and through which the conductor (25) extends. An output cable (34) is connected to the connector unit, which also provides contacts (37) for connection to a test unit. A cover (40) protects the connector unit and interlock means (58,43) act to allow opening of the cover only when the switch (12) connects the output contacts with the earth contacts.

Abstract: An intraocular posterior chamber lens which has two resilient support portions with protruding contact points for seating the lens in the lower groove portion formed by the anterior and posterior capsules of the eye. The lens also includes an upwardly extending stabilizing portion adapted to be positioned posteriorly of the iris of the eye without being seated in the upper groove portion of the eye. The stabilizing portion provides vertical stabilization of the lens in the eye. The lens can be easily implanted in the posterior chamber of the eye and can be easily removed by a surgeon at a later date, if necessary, without substantial damage to the eye.

Abstract: Medical breathing apparatus which provides repeated short bursts of oxygen separated by longer intervals of time to the wearer of a surgical mask to supplement his breathing.

Abstract: Apparatus for and method of irrigating and aspirating an eye utilizing valves in a conduit and conduit branches to control the flow of fluid into and out of the eye under the force of gravity.

Abstract: An intraocular lens and method of positioning the same in an eye in which the lens includes a layer of material which is soluble in the eye for stiffening the position-fixation members of the lens during insertion thereof into the eye.

Abstract: An intraocular lens and method of positioning the same in a human eye in which the lens has, for example, two body portions which are separable outside the eye and two position-fixation members extending therefrom. The individual lens body portions and position-fixation members can be snaked into the eye through a smaller opening in the eye than the diameter of the lens body and the individual lens portions are connected together inside the eye by the surgeon to form the lens which is then positioned and seated in the eye by the surgeon.

Abstract: A cutting blade for a hand-held cutter for cutting a cloth cover from a dampener roller without damaging any material under the cutter. The blade has an upwardly curved front bottom edge portion, a convexly curved front tip portion, and a concavely curved upwardly extending cutting edge portion.

Abstract: In a positive drive power transmission system composed of a toothed belt and two or more pulleys, operating noise resulting from the impact of the belt and the pulleys is dramatically reduced by having surface discontinuities on either the belt or on the pulleys on those surfaces where the belt and the pulleys engage in impact contact when in operation. The surface discontinuities may be formed by recessed or raised portions of the belt or pulleys, may be straight or curved, and may be substantially parallel to the tensile member or at an angle thereto. Several methods of manufacturing belts with such surface discontinuities are disclosed.

Abstract: An intraocular lens structure utilizing a lens which may be placed adjacent the posterior side of the iris and adapted for covering at least a portion of the pupil. The structure includes a first position fixation element connected to the lens body which extends away from the same to the periphery of the iris for engagement in the posterior chamber. A second position fixation element connected to the lens body includes a first portion which extends away from the lens body, a second portion intended for passing through an opening in the iris wall into the anterior chamber and an end portion which extends to the periphery of the iris in the anterior chamber and engages the same. The end portions of the first and second position fixation elements are sprung between the anterior chamber angle on the one hand and the capsular sulcus on the other hand.

Abstract: A pulley configuration which increases the contact area between the pulley tooth tips and the land area of the belt teeth. The increased contact area reduces land area wear between belt teeth. The pulley tooth tip has a longitudinal cross-sectional contour partially composed of two substantially circular arcs connected by a line segment which is substantially straight or slightly curved. The length of the line segment is from 5 percent to 100 percent of the width of the belt tooth on which the pulley is used, and preferably between 6 percent and 33 percent of the width of the belt tooth. The pulley in combination with a toothed belt forms a positive power transmission system.

Abstract: An apparatus and method for measuring the anterior chamber diameter of the eye is disclosed in which a device illuminates the opposite end points of the annular groove. A gauging device cooperates with the illuminating device so as to provide to the viewer through a goneal assembly, a recognizable signal corresponding to a measure of the distance between the end points for gauging the distance.

Abstract: A toothed positive drive power transmission belt of the type having an endless substantially inextensible tensile member to which the belt teeth are secured, which teeth have a curvilinear cross-section and may be covered by an outer protective fabric or the like. In the body of each tooth is a layer of fabric reinforcement separated from the outer surface of the belt teeth by a cushion layer of soft elastomeric material so that the outer surface is free to flex while the inner portion of the tooth is reinforced against shearing.