We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
ciliated. If thru the points of the R curve having these vakies of d. ordinates be drawn, deflections represented by these ordinates wih have the assumed values in lumens of the light falling upon the opal glass of the cell, divided by the intrinsic brilliancy of the source — or, since the lumens are proportional to the brilliancy — the lumens per unit brilliancy. Since the source brilliancy was the same for all the curves, the ordinates chosen in this way give also the lumens delivered to the projection lens per unit intrinsic brilliancy of the source.
TABLE 1— MAXIMUM VALUE, C, OF ILLUMINATION FOR STANDARD APERTURE Focal Length Projection Lens 5.5"
Projection
Fig
2
Fig
. 3
Fig
. 4
Fig. 5
Curve
Lens
Source
,
N umber
Diameter
Side
d,
C
di
C
d,
C
di
C
1
2.5"
.5"
14
. 0754
22
.0755
16
.0722
SO
.0604
2
2.5"
A"
14
.0651
22
.0656
18
.0650
80
.0493
3
2.5"
.3"
14
.0507
22
.0496
19
.0470
78
.0334
4
2.. 5"
.2"
14
.0280
22
.0270
15
.0260
80
.0175
5
2"
.5"
14
.0498
22
.0513
16
.0481
80
.0441
6
2"
.4"
14
.0460
22
. 0490
16
.0452
78
.0380
7
2"
.3"
14
.0400
20
.0412
16
.0410
78
.0281
8
2"
.2"
14
.0270
22
.0243
16
.0250
79
.0160
9
1.5"
.5"
14
.0301
22
.0305
16
.0290
80
.0289
10
1.5"
.4"
14
.0291
21
.0297
16
.0279
78
. 0270
11
1.5"
■?',',
14
.0276
21
.0286
16
.0278
80
.0210
12
1.5"
14
.0215
21
.0208
16
.0223
80
.0123
This method of evaluating the deflection avoids all question of the proportionality of deflection to light falling upon the cell. That these two quantities are closely proportional, however, is shown by the equi-spacing on the plates of the lines calculated for equal illumination differences.
In Tables 1 and 2 are given the maximum values of the illumination (C) in lumens per unit brilliancy for the various combinations of source sizes, and projection lens diameters represented by the different curves of Figures 2 to 9.
Summaries of 1 ables 1 and 2 will be found in Figures 10 and 1 1 respectively, llie relation between C and source side is here plotted for different diameters of projection lenses as indicated.
TABLE 2— .MAXIMUM VALUE, C, OF ILLUMINATION FOR SAFETY STANDARD APERTURE.
' Focal Length Projection Lens 3.75"
Curve
Projection
Fig. 6
Fi
g. 7
f:
ig. 8
Fig. 9
Lens
Source
—
Number
Diameter
Side
di
C
d.
C
d,
C
di
C
1
2.0"
. 5"
.0739
25
.0651
18
.0675
84
.0483
2
2.0"
.4"
. 0669
26
. 0580
18
.0595
84
.0402
3
2.0"
.3"
.0515
26
.0441
17
.0404
SO
.0286
4
2.0"
.2"
. 0300
25
.0249
18
.0240
84
.0160
5
1.75"
. 5"
.0564
25
.0543
18
.0535
82
.0.385
6
1 . 75"
.4"
.0547
26
.0516
18
. 0507
80
.0362
7
1.75"
.3"
.0450
26
,0415
18
.0400
S2
.0265
8
1 . 75"
.2"
.0271
25
. 0240
19
.0235
79
.0151
9
1 . .5"
. 5"
.0425
23
.0421
18
.040()
80
.0346
10
1.5"
.4"
.0417
27
.0411
18
.0416
S3
.0310
11
1 . 5"
.3"
.0389
27
.0362
IS
. 0360
SI
.0232
12
1 . 5"
.2"
.0252
25
.0227
IS
.0230
79
.0132
13
1.25"
.5"
.0298
23
.0390
IS
.0297
SO
.0253
14
1.25"
.4"
.()29fi
25
. 0298
IS
.0290
SO
.0239
15
1.25"
. 3"
. 0292
25
. 0288
IS
.0294
SO
.0198
16
1.25"
.2"
.0219
25
.0209
IS
.0212
79
.0119
17
1.0"
.5"
.0194
25
. 0204
18
.0196
SO
.0170
18
1.0"
.4"
.0194
2(i
.0204
IS
.0196
80
.0165
19
1.0"
.3"
.0185
26
. 0204
18
.0196
SO
.0145
20
1.0"
.2"
.0160
25
.0180
18
.0171
80
.0103
25