No. 1. 
Hartley. 
Phil. Trans. 1879. Plats 21. 
Diagram showing the Effect of Water and of the Alcohols on the Ultra- Violet Rays of 
Metallic Spectra. 
Thickness of the layer of liquid = 075 inches 
Zro Al 
43. M. JtSM.J8.2MS.J0. J1 JZ 
Lines showing the Length of Spectra given by the Metallic Electrodes used in these Experiments. 
Cadmium and Zinc 
Indium and Zinc... 
Amalgam and Iron Point 
Nickel Points 
Bays transmitted through Quartz Cells by Amalgam and an Iron Point. 
One empty cell ... 
Two cells ... 
Three cells 
DISTILLED WATER. 
(1.) Amalgam and Iron Point ... 
(2.) Indium and Cadmium 
METHYLIC ALCOHOL. 
(1.) Apparently quite pure,boiling 
point 66°C. 
(2.) From Oil of WintergreeD, ,, 
60-5° 
(3.) From Methylie Oxalate, ,, 
6G° 
(4.) From Methylie Oxalate, ,, 
66° 
ETHYLIC ALCOHOL. j 
(1.) Commercial Absolute, boiling point 79°C. 
(2.) Commercial Absolute 
(3.) Very carefully purified, ,, ,, 79° 
PROPYLIC ALCOHOL. 
(1.) One cell full, boiling point 97‘5°C. 
(2.) Two cells... 
(3.) Three cells 
OCTYLIC ALCOHOL. 
From Heracleum Oil, boiling point 192'5°C 
Wave Length of 
Cadmium Lines 
is 
' i 
tyj ^ 
5 
IS 
? H 5 Za Al. 
C\* ^ ^ ^ 
^ ^ . vi O vi_ ^ 
Termination of Visible Rays. 
Invisible Rays. 
