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Figures (4)

Fig. 1
Fig. 1

Filters of Class 1 Legend to Fig. 1. Filters of Class 1.

Filter (Curve) No.MaterialRemarksThickness in MillimetersReferenceInfrared Limit

Bibliography No.PageFig.No.

F1FluoriteBest quality, colorlessThin plates2775Cf. Fig. 2.
F2FluoriteSchumann’s mapPrism+lenses2775Cf. Fig. 2.

Q1QuartzCrystalline0.22756Cf. Fig. 2.
Q2QuartzCrystalline. No great difference for right or left handed pieces or for those cut ⊥or ∥ to axis22756–57, 13Cf. Fig. 2.

W1WaterDistilled—fluorite windows —prolonged exposure0.52760Cf. Fig. 2.
w2WaterPure—quartz windows?2025Cf. Fig. 2.

RSRock Salt?2757, 13–14Cf. Fig. 2.
EAEthyl AlcoholChemically pure, from Merck1034Approximately equivalent to water.
CaCalcite⊥ to axis6.134Cf. Ref. 31.
GlGlycerineChemically pure, from Merck1034Approximately equivalent to water. Cf. Ref. 8, Fig. 5.
MMica0.011065342Cf. Ref. 3, No. 65, pp. 48–49.

G′GlassJena “Uviol” cover glassExtremely thin2712So far as known, all white, yellow, orange, and red glasses have infrared transmissions similar to G1–G2 of Fig. 2. Cf. also Fig. 3b. Those containing iron impurities have a broad weak absorption band centering at 1.1/μ. Cf. Ref. 6 and 11.
G″GlassJena “UV Crown 3199”1217
G‴GlassCorning “G 174 S Ultra”0.391734

G1GlassCommon cover glassExtremely thin2712Cf. above.
G2GlassAm. Opt. Co., “Crown 1.50”1.68162A
G4GlassAm. Opt. Co. “Crookes A” (or “Cruxite”)2.05163A

G5–G8GlassCorning “Noviol”2.00–4.231680Cf. above.
G9–G12GlassCorning “G 34”1.50–3.4517723–25
17726, 29, 30
G13GlassCorning “G 24” (“Signal Red”)0.8817618
G14GlassJena “4512”2.25191915

D1–D3Dyed Gelatine filmsE. K. Co. Wratten filters. Data not given above 700 mμ. Most of curves G414 can be practically duplicated by the Wratten filters.?452,89, 89aCf. Ref. 6, p. 655, and Ref. 28

CAqueous solution of copper sulphate57.0 grams of CuSO4.5H2O to 1 liter of solution. Filter of Class 2. Transmits ultraviolet to about 300 mμ.10.00181161Cf. Ref. 5.
Fig. 2
Fig. 2

Filters of Class 2 Legend to Fig. 2. Filters of Class 2. (Cf. also Curve C, Fig. 1.)

Filter (Curve) No.MaterialRemarksThickness in MillimetersReferenceUltraviolet Limit

Bibliography No.PageFig.No.

WWaterThin quartz windows1097343Cf. Fig. 1.

G1GlassCorning “Pyrex”11.997353Cf. Ref. 17, Fig. 3, No. 6.
G2GlassCrown2.18122571Cf. Fig. 1.

QQuartzCrystalline4.7797342Cf. Fig. 1.
FFluoriteColorless1037737Cf. Fig. 1.
RSRock Salt1037737Cf. Fig. 1.
SSylviteStrong narrow absorption bands at 3.18 and 7.08μ1037737
Fig. 3a and 3b
Fig. 3a and 3b

Filters of Class 3 Legend to Figs. 3a and 3b. Filters of Class 3.

Filter (Curve) No.MaterialRemarksThickness in mm.Reference


Bib. No.Fig.No.Bib. No.Fig.No.

ClChlorine gasQuartz cell. Molar concentration of gas= 4)*
Cl–BrChlorine gas and bromine vapor, mixture.Quartz cell. Molar concentrations of chlorine and bromine = 0.088 and 0.0092, respectively. Advantage of combination over chlorine alone lies in the strong absorption in the blue where chlorine transmits.10.33(Table 5)*

AgMetallic silverChemically deposited on quartz. No infrared transmitted.0.0000792020

G1GlassCorning “G 586 P.” No infrared.4.3717 (Cf. 14)2187
G2GlassCorning “G 586 J.” No infrared.2.682.8017 (Cf. 14)21856(p. 667)
G3GlassCorning “G 586 A.”3.202.8517 (Cf. 14)2183614C

G4GlassCorning “G 585.” (Equivalent to Jena “3654”.)4.623.1317 (Cf. 14)1769613A
G5GlassCorning “G 53.”2.592.4017 (Cf. 14)1875613D
G6GlassJena “8780.” Infrared somewhat similar to G5.2.99171563

G7GlassCorning “Signal Green.”5.554.9317 (Cf. 14)1458610C
G8GlassJena “4930” (Equivalent to Corning Sextant Green.”) Infrared similar to G7 and G9.2.9917 (Cf. 14)1251
G9GlassAm. Opt. Go. “Electric Smoke.” Should be tested for possible violet transmission.2.4616 (Cf. 14)21K614B

C–KAqueoussolutions of copper sulphate and potassium dich-romate, combined transmission.57.0 grams CuSO4.5H2O to 1 liter of solution. 72.0 grams K2Cr2O; to 1 liter of solution. Practically no infrared, but Cf. Ref. 5.10.0mm of each solution in separate glass cells.181(Table 2)
These table numbers refer to English translation.
Fig. 4
Fig. 4

Special Glasses for Transmitting the Ultra-violet

Tables (3)

Tables Icon

Table 1 Legend to Fig. 1. Filters of Class 1.

Tables Icon

Table 2 Legend to Fig. 2. Filters of Class 2. (Cf. also Curve C, Fig. 1.)

Tables Icon

Table 3 Legend to Figs. 3a and 3b. Filters of Class 3.

Equations (2)

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t = b T transmissivity log T = b log t } Lambert’s law .
t = bc T specific transmissivity log T = b c log t } Beer’s law .