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    "localId": "75718474",
    "label": "Letter Sent to C.H. Dimick, January 13, 1920",
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    "id": "75718474",
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    "title": "Letter Sent to C.H. Dimick, January 13, 1920",
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        "Safety Light Collection",
        "Records Related to Radium Dial Painters"
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    "seq": 3,
    "pageIndex": 0,
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    "ocrText": "- 3 -\nrecommendations which we make relative to changing the physical characteristic para-\ngraph in these specifications will be adopted. I spent several hours with Mr. Hart\nand attempted with success to bring his department into closer touch with W.\nE.\nDorrey, Bureau of Standards.\nInasmuch as Mr. Hart does not wish to appear to be anything\nbut neutral in this matter, he has requested that we forward him a letter out-\nlining the changes we desire in order that he may have it as a matter of record\nto show cause why he changed these specifications, provided such a question should\narise. I have to report a very cordial and open minded attitude on the part of\nMr. Hart and we can depend upon him to assist us in any way that he can consistently.\nMr. Hart referred me with regard to specifications for the\nAviation to\nBUREAU ÒF NAVIGATION, WASHINGTON, D. C. (Room 3614) This department referred\nme to Bureau of Crdnance - Lieut. Commander Stott, with whom & talked and had a\nsatisfactory interview but of no immediate pertinent advantage.\nBUREAU OF STANDARDS.\nW. E. Dorsey, (Telephone \"leveland 1720-Washington, D.C.)\nradium and luminous material expert, is an authority who is in sccord with our\nideas on what luminous material should be and a scientist whose opinion ie\nrespected, and should be our pivot upon securing scientific endorsement for any\nsuggestions which we have to offer for Government Repartments. Among other things\nthat he stated and which should be a matter of record, the following are pertinent:\nExperiments which he has carried on ith various diale show\nthat luminous material is not injured in any way by either ultra-violet ray,\nsunlight or daylight, and that a dial exposed immediately in front of° a quart lamp\nfor a week at a. time shows no diminution in luminosity as compared with a dis. kept\nin absolute darknoss. Either he is incorroct or 8. fallacy is being promulgated in\nyhis matter. The brightness of an applied material varies directly in proportion\nto the thicknessup to 1/2 millimeter. Any application of greater thickness than this\nis\nnot\nnecessary One micro lambert equals .318 nill-candles per square centimeter.\nExperiments which he carried on several years ago show that Radium Pial, Cold Hight\nand our own naterial decreased in luminosity s.t practically the same rate, the\ndifference being so slight that he did not care to make it a matter of record.\nDr. Dorsey wishes it understood that his experiments were\ninterrupted by the War and that he is now not up to date on any of his experiments\nin this ditter. He claims that eneither he or anyone that he knows of has been\nable to break down zine sulphide by artificial means for longevity of the material\nby means of a laboratory test. Dr. Porsey has never seen a material which will\nhold its own or grow in luminosity after the first month. (Material of this sort\nUI. Sochocky tells me today that he will send to Dr. Dorsey at an early date).\nThis will be very valuable from our point of view.\nDr. Dorsey ha.e a professional pride in his opinions on lumin-\nous material and he has contended against much opposition for many years that the\nuse of mesothorium in luminous material is justifiable, so that provided we care\nto use this material we could not only count upon Dr. Forsey's ordinary cooperation due\nto his acquaintance with us, but also to the gratification of his professional\nvanity in this matter.\nDr. Dorsey's appropriation has been severely cut and he is very"
}