Many metals have been found to exhibit evidences of volatility at temperatures considerably below their melting points. As long ago as 1872, Merget demonstrated that frozen mercury volatilised perceptibly in air in course of time. Demarçay, in 1882, conducted similar experiments in vacuo and found that cadmium evaporated sensibly at as low a temperature as 160°, zinc at 184°, and lead and tin at 360° C. In 1887, Zenghelio obtained evidence of the volatility of lead, copper, zinc, etc., even at room temperatures. Spring, in 1894, working at atmospheric pressure, showed that zinc was appreciably volatile at 300°, and cadmium and copper'at 500°. Roberts-Austen and Merrett, in some unpublished experiments at the Royal Mint, in 1896, detected the volatility of cadmium and zinc at 100° in vacuo , while Krafft in 1903 and 1905 investigated in some detail the volatilisation of a number of metals at low pressures. Rosenhain, at the National Physical Laboratory, has obtained beautiful crystals of sublimed zinc by heating a piece of zinc to 300° C. for some weeks in a glass tube containing hydrogen at atmospheric pressure. The notable phenomena of the interdiffusion of metals, with which Roberts-Austen’s name is associated, provide, of course, additional evidence of the vapour pressure that solid metals exert even at ordinary temperatures.

Second source manufacturers of guided missiles require efficient, cost effective test analysis and evaluation techniques to assess system flight test performance. This requires a top down approach to develop the simulation and the data processing system. Raytheon used the top down approach to develop a completely automated data processing system that combines the functional steps of analysis into a unified data processing system. This data processing system permits analysts to conduct preflight and postflight analysis of flight tests using data from many sources such as the test range instrumentation, missile telemetry, and system simulations. The system must allow for the comparison of predicted and actual data.The analysis and evaluation requirements that are unique to the contractor ~nclude short development time of data processing and simulation compatibility, the use of as much existing processing capability as possible, limited ability to influence available sources of data from the system under test, and the need for quick turnaround on post-mission assessment before committing to new launches.Raytheon responded to these requirements and developed a successful analysis and evaluation system that was a key factor in making the Infrared (IR) Maverick second source qualification program successful. X X Pitchffaw T a r q~t Tralectorv Data Position Velocity Acceleration Copyright O American In! Astronautics, Inc., 198 Ute of Aeronautics and All rights reserved. Downloaded by KUNGLIGA TEKNISKA HOGSKOLEN KTH on August 24, 2015 | http://arc.aiaa.org |

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