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copy for Dr
R. L.
M. C. INTERIOR MEMORANDUM 9/23/19
Date
Subject
Mr. Dimick.
For Attention of
Answering Memo. of
COMPARATIVE LUMINOSITY OF 'UNDARK' AND 'LUMA.
Below is a table that shows the measurement of luminosity,
the net price, and the cost per unit for six samples of Luma and eleven samples
of Undark:-
leasurement
Net Price
Cost per
Unit
JUNE
Luma 6
19
$ 18.50
$3.52
5
21
13.25
2.78
4
23
12.25
2.82
3
25.3
10.50
2.66
2
28.5
7.00
2.00
1
37.
3.50
1.20
JULY
R.L.M. B
16
17.25
2.76
D
17
12.00
2.04
E
20
8.10
1.62
F
21
6.00
1.26
G
22.7
4.35
.99
H
26.5
3.25
.86
I
30
2.25
.68
J
34
1.75
.60
39
1.45
.47
L
47.5
1.25
.59
M
57
.85
.49
The measurement ie a record of the reading taken in our labor-
atory and is probably as accurate 8 8 it is possible at this time to make obser-
vations of luminous material. As you know, this work is all done in the dark.
The operator does not know what the reading will be untilnafter his measurement is
made and his gauge fixed. Thie method insures accurate and aprejudiced readings.
The samples of Luma were secured in Junen and were delivered
before the materials had reached their maximum or point of equilibrium 80 that these
maximum readings can be considered to represent best Luma quality. Somotimes
we
secure samples of competitors' materiale and we are not sure of the dates of man-
ufacture, whether the material is new or old or the condition in which it has been
kept, etc., so that we are not always sure that we are doing our competitors full
justice in making the readings, but in the case reported above, we are convinced
that the comparisons are extremely close and well made.
The measurements as read show a lesser amount for high lumin-
osities than for low luminosities. In other words, the scale ie reversed. Thie
has been corrected in Column #3 showing cost per unit of luminosity, the unit of
course being an arbitrary factor but necessarily a constant in all readings.
The net price for Luma is their regular quotation less 10 %
which NO believe corresponds to our minimum schedule.
It is safe to assume that
should this not be a fact that these prices are not more than another 10 % out of
the way.
(Continued)
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"ocrText": "copy for Dr\nR. L.\nM. C. INTERIOR MEMORANDUM 9/23/19\nDate\nSubject\nMr. Dimick.\nFor Attention of\nAnswering Memo. of\nCOMPARATIVE LUMINOSITY OF 'UNDARK' AND 'LUMA.\nBelow is a table that shows the measurement of luminosity,\nthe net price, and the cost per unit for six samples of Luma and eleven samples\nof Undark:-\nleasurement\nNet Price\nCost per\nUnit\nJUNE\nLuma 6\n19\n$ 18.50\n$3.52\n5\n21\n13.25\n2.78\n4\n23\n12.25\n2.82\n3\n25.3\n10.50\n2.66\n2\n28.5\n7.00\n2.00\n1\n37.\n3.50\n1.20\nJULY\nR.L.M. B\n16\n17.25\n2.76\nD\n17\n12.00\n2.04\nE\n20\n8.10\n1.62\nF\n21\n6.00\n1.26\nG\n22.7\n4.35\n.99\nH\n26.5\n3.25\n.86\nI\n30\n2.25\n.68\nJ\n34\n1.75\n.60\n39\n1.45\n.47\nL\n47.5\n1.25\n.59\nM\n57\n.85\n.49\nThe measurement ie a record of the reading taken in our labor-\natory and is probably as accurate 8 8 it is possible at this time to make obser-\nvations of luminous material. As you know, this work is all done in the dark.\nThe operator does not know what the reading will be untilnafter his measurement is\nmade and his gauge fixed. Thie method insures accurate and aprejudiced readings.\nThe samples of Luma were secured in Junen and were delivered\nbefore the materials had reached their maximum or point of equilibrium 80 that these\nmaximum readings can be considered to represent best Luma quality. Somotimes\nwe\nsecure samples of competitors' materiale and we are not sure of the dates of man-\nufacture, whether the material is new or old or the condition in which it has been\nkept, etc., so that we are not always sure that we are doing our competitors full\njustice in making the readings, but in the case reported above, we are convinced\nthat the comparisons are extremely close and well made.\nThe measurements as read show a lesser amount for high lumin-\nosities than for low luminosities. In other words, the scale ie reversed. Thie\nhas been corrected in Column #3 showing cost per unit of luminosity, the unit of\ncourse being an arbitrary factor but necessarily a constant in all readings.\nThe net price for Luma is their regular quotation less 10 %\nwhich NO believe corresponds to our minimum schedule.\nIt is safe to assume that\nshould this not be a fact that these prices are not more than another 10 % out of\nthe way.\n(Continued)"
}