a question as to the color temperature of a ground shot compared to an air drop or . @ tower shot, and so for my information with the spectrometer giving us the spectral distribution of emergy, we hope to tie down the color temperature of a surface shot and the color temperature of an air drop. We will also be looking at the larger weapons from the air, and that's one nice thing about having Program 5 flying all these instruments and our working with them. We have the advantage of getting all the data so we can compare this data with the ground measurements. Cn 8.2, in the laboratory we cannot change the color temperature from zero time to the end of the radiation. We have tried with filters, but using then we cut down the thermal radiance, so we need a field test like this to give us check points on all of our materials, In the field we have some standard papers which we have been able to reproduce. These have two thicknesses, and varying shades and grades from a black to a white, and we have two different densitites. What we plan is to have little boxes - 14 samples ~ some of these will be burned up and some will not be burned up, so this will be a goat for a noble proposition, and we will be able to count the number of pieces, and get down to the density, thickness, the absorptivity of pieces of material, and correlate that with the bomb energy. We will use attenuating screens, five attenuating screens to give us the effect of five distances from the point of detonation. We will need to put one calorimeter and one radiometer behind each of these screens. By coordinating all these activities we can put the animals from 4.2, the cellulose materials from Forestry ) Service, and the wood from NRDL all on one rack behind these screens and use one calorimeter to correlate all these data. Project 8.3 = Evaluation of Self-Recording Thermal Indicators - J. C. Maloney - CRL The title of this project is "Evaluation of Self-Recording Thermal Indicators", Its general objective is the testing and evaluation of detectors and recorders for determination of total thermal radiation flux. Special objectives of the test are to enable us to develop and decide on a more versatile instrument. We want an instrument that is relatively simple and inexpensive, or at least as many of these properties as we can test out and get. The instrument preferably should be self-contained and be made smaller and more readily adaptable to hanging on poles, ships, or airplanes. Freferably, the instrument should be independent of outside signals and one idea I am trying to put in is to make the instrment independent of using lead batteries, Now three types of instruments are being modified and worked on in the Lab; they are: (1) the thermistor calorimeter detecting instrument, either an electric recorder or a tape recorder. Incidentally, the main features of these instrumeni.s were tested in TxAPOT but we are trying to make some workable improvement in themg (2) the experimental thermal flux recorder, developed by the Kidde Nuclear Laboratories; this instrument uses a magnetic tape that is completely independent of an outside signal; (3) a passive indicator = which will be independent of pulse shape. Chemically treated papers will be used as recorders, It is also to be independent of an outside signal,