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    "label": "Letters Sent to Dr. Herman Schlundt, November 18, 1929",
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    "title": "Letters Sent to Dr. Herman Schlundt, November 18, 1929",
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    "ocrText": "-2-\ngood working condition, but as soon as the reference standards do not agree\nthen we assume that there has a change come about and we at once return our\nreference standards to the Electrical Testing Laboratory for recalibration.\nAt the time we ordered this equipment from Leeds & Northrup we had\nthem quote us on these reference standards, but found their price excessively\nhigh. We, therefore, had the reference standards manufactured according to\nour own specifications by the Roseville Engineering and Machine Company of\nNewark, N.J. These reference standards cost approximately $25.00 each, and\nshould you desire such standards we would suggest that you allow us to take\ncare of obtaining them.\nTo operate the reference standards in conjunction with the controller\nbox of the illuminometer equipment it is necessary to have an additional\nplug, the number of which, on our order of November 21,1927, is #6812.\nUnless you have some neans for calibrating this instrument there at the\nUniversity, I would strongly urge that you obtain reference standardsin\nconnection with the apparatus - otherwise, you can never be sure that your\napparatus is functioning properly. This is especially true, if you place\nthis instrument in the hands of your students, for it is my observation that\nso long as one person who is familiar with the apparatus handles it the\napparatus remains fairly constant, but it does not take very much handling\nby other people until something happens whereby you have no faith in the results\nobtained.\nThe color gelatine film used to obtain a color match was supplied by\nthe Eastman Kodak Company and was ordered by us to be shipped to Leeds &\nNorthrup. The specification for this filter is #60-P. We ordered two (2)\nsquare inches and the cost was approximately 800.\nI trust that with this information you will feel better qualified to\nproceed with the placing of your order.\nIn the evant that I can be of any further assistance do not hesitate\nto call upon me.\nSincerely yours,\nVice President.\nHHBarker:R"
}