CONTENTS. 
Page. 
Letter of transmittal ....„„ 15 
Preface 17 
Introduction 23 
General account of methods of py rometry 23 
Earlier digests * 23 
Character of the measurements 24 
Classification of pyrometers '. 25 
Dilatation of solids 25 
Dilatation of liquids 27 
Dilatation of gases (manometric methods) 27 
Dilatation of gases (displacement methods) 36 
Vapor tension 38 
Dissociation . 38 
Fusion 39 
Specific heat '. 40 
Ebullition 42 
Heat conduction 42 
Radiation 43 
Viscosity 46 
Acoustics - 47 
Thermo-electrics 48 
Electrical conductivity 50 
Magnetism 52 
Interpolation methods 52 
Advantages of thermo-electric pyrometry 52 
Chapter I. — The degree of constant high temperature attained in metallic 
vapor baths of large dimensions ; by C. Barus and W. Hallock 56 
Explanation 56 
Apparatus , 57 
Remarks 57 
Low boiling points 58 
Boiling points between 100° and 300° 59 
Apparatus for mercury 61 
Boiling point of zinc 62 
Experimental results 67 
Methods of measurement -- 67 
List of thermo-couples 68 
Data for mercury vapor baths 69 
Data for zinc vapor baths 70 
Inferences relative to low percentage alloys 77 
Reduction of data 77 
Series of alloys 79 
(659) 5 
