AUTOMATIC DETERMINATION OF MELTING POINTS,
Abstract
An automatic melting point apparatus was designed and a laboratory model fabricated whereby melting points may be determined on transparent or semitransparent crystal-line solids. The apparatus uses polarized light to detect changes in birefringence as the solid anisotropic form changes to the isotropic melt. A photoconductor and a thermocouple act as transducers to generate voltages corresponding to light intensity and temperature, respectively, as a sample is heated. These voltages are fed to an X-Y recorder which provides a permanent record of the melting phenomenon. A qualitative discussion of the properties of crystalline solids and the interaction of these solids with polarized light is included. The equipment, its operation, and directions for use are described in detail. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1963
- Accession Number
- AD0419983
Entities
People
- Emlen Linton Martin Jr.
Organizations
- Air Force Institute of Technology