56 
PROFESSOR HUGH L. CALLENDAR ON 
Part III.— Electrical Thermometry. 
Page 
(18.) The Compensated Resistance Box.. . 87 
(19.) Heating of the Thermometers by the Measuring Current. 92 
(20.) Ice-point Apparatus. 94 
(21.) Insulation of Thermometers. 95 
(22.) Differential Measurements. 96 
(23.) Reduction of Results to the Hydrogen Scale. 97 
Part IV.— Calorimetry. 
(24.) Temperature Regulation.102 
(25.) Preliminary Experiments on the Specific Heat of Mercury.104 
(26.) Method of Determining the True Mean Temperature of Outflow . . 105 
(27.) Design of the Water Calorimeter. 107 
(28.) Improvements in the Design of the Calorimeter.. . 108 
(29.) Effect of Variation of Viscosity. 109 
(30.) Radial Distribution of Temperature in the Fine Flow-Tube. 110 
(31.) Electrical Method of Measuring the Thermal Conductivity of a Liquid.112 
(32.) Superheating of the Central Conductor.114 
(33.) Methods of Eliminating Stream-Line Motion.116 
(34.) Correction for Variation of Temperature-Gradient in the Flow-Tube. 121 
(35.) Application to the Mercury Experiments .. 123 
(36.) Correction of Results with the Water Calorimeter. ... 125 
(37.) Variation of Gradient-Correction with Temperature.128 
Part V.— Discussion of Results. 
(38.) Meaning of the Term “ Specific Heat.”. 130 
(39.) Choice of a Standard Temperature for the Thermal Unit.131 
(40.) Choice of a Standard Scale of Temperature. 133 
(41.) The Work of Regnault .134 
(42.) The Work of Rowland . 136 
(43.) The Method of Mixture. Ludin . 137 
(44.) The Work of Miculescu. . 138 
(45.) The Work of Reynolds and Moorby . 139 
(46.) Empirical Formulae . . 141 
(47.) Theoretical Discussion of the Variation of the Specific Heat. 144 
List of Illustrations. 
Fig. 1. Diagram of Thomson-Varley Slide-Box. 63 
„ 2. Compensated Resistance Box. 90 
,, 3. Ice-Point Apparatus. 94 
,, 4. Hermetically-sealed Thermometers. 95 
„ 5. Heater, Circulator, and Regulator. 102 
„ 6. Diagram of Mercury Calorimeter.104 
