Horizontal Cone Research Articles

Vapour pumping groups

Design features. The vapour booster was introduced in the early 1960s. It is part diffusion pump and part ejector. A typical design is shown in Figure 1. The vertical jet operates in the same way as a diffusion pump, the operation of which is described later, and the horizontal jet is the ejector. At low suction pressures the oil vapour jet stream emerges from the ejector at a wide angle and throttling would occur if the oil vapour were not condensed. When the suction pressure increases, the angle of the vapour jet stream is reduced until when the maximum pumping throughput is reached the jet only impinges near the smallest diameter of the horizontal cone.

The fixed horizontal neutron therapy beam at Edinburgh: dosimetry and radiation protection.

A compact cyclotron producing 15 MeV deuterons has been installed at the Western General Hospital, Edinburgh, to extend the Medical Research Council's clinical trials of fast neutrons. Two treatment rooms are available one of which has an isocentric unit and the other a fixed horizontal beam which is the subject of this paper. A radiation protection survey has demonstrated safe levels of radiation throughout the building although there is some activation of the fixed horizontal beam cone resulting in doses to radiographers of 10 mrem per week. The calibration of neutron dose is discussed and the measurements of dose distribution described. Isodose and depth-dose data for both the neutron and photon components of the field are presented.

An Optical Classification of Keratoconus a Preliminary Report

The paper describes a procedure utilizing a modified biomicroscope and corneal toposcope for the objective determination of the physical parameters of the corneal cone (horizontal cone width and sagittal depth) and the development of a classification of the condition based on comparative ratios of the obtained data.The paper initially describes some existing classifications based on: (a) photo‐keratoscopic findings: (b) correlation of the disease stage to visual acuity; (c) observable corneal changes associated with the disease severity; and (d) sequential studies utilizing an electron microscope.The paper then describes the research plan with emphasis on the specific instrumentation utilized and the types of data obtained. A discussion is presented of Lindstedt's device as altered by Stenström, and a procedure noted for the approximate alignment of the target on the corneal apex. By virtue of the methods described, it is felt that the practitioner will have the means to detect more accurately and chart the course of the keratonic condition.

MANUAL OF CLINICAL CARE

The paper describes a procedure utilizing a modified biomicroscope and corneal toposcope for the objective determination of the physical parameters of the corneal cone (horizontal cone width and sagittal depth) and the development of a classification of the condition based on comparative ratios of the obtained data. The paper initially describes some existing classifications based on: (a) photokeratoscopic findings; (b) correlation of the disease stage to visual acuity; (c) observable corneal changes associated with the disease severity; and (d) sequential studies utilizing an electron microscope. The paper then describes the research plan with emphasis on the specific instrumentation utilized and the types of data obtained. A discussion is presented of Lindstedt's device as altered by Stenström, and a procedure noted for the approximate alignment of the target on the corneal apex. By virtue of the methods described, it is felt that the practitioner will have the means to detect more accurately and chart the course of the keratonic condition.

An optical classification of keratoconus--a preliminary report.

The paper describes a procedure utilizing a modified biomicroscope and corneal toposcope for the objective determination of the physical parameters of the corneal cone (horizontal cone width and sagittal depth) and the development of a classification of the condition based on comparative ratios of the obtained data. The paper initially describes some existing classifications based on: (a) photo-keratoscopic findings: (b) correlation of the disease stage to visual acuity; (c) observable corneal changes associated with the disease severity; and (d) sequential studies utilizing an electron microscope. The paper then describes the research plan with emphasis on the specific instrumentation utilized and the types of data obtained. A discussion is presented of Lindstedt's device as altered by Stenstrom, and a procedure noted for the approximate alignment of the target on the corneal apex. By virtue of the methods described, it is felt that the practitioner will have the means to detect more accurately and chart the course of the keratonic condition.