Schedule of Classification 



PAGE 



0340 Colloidal Substances ... 76 



0400 Molecular Theories of Crys- 

 tals and other Solids. (See 

 also Elasticity, Mechanics 

 3210 and Mineralogy 140.) 76-79 



Ultimate Physical Theories. 



0500 Theories of the Constitution 

 of Matter. (See Vortex- 

 Motion, Mechanics 2450, 

 and Physical Chemistry, 



Chemistry 7000.) 79-82 



Action at a Distance ... 79 



Atoms 79-80 



Matter 80-81 



Vortex Theories ... 81-82 



0600 Theories of the Ether. (See 



also Astronomy 1830.) 82-84 



The Ether 82-84 



0700 Dynamical Theories of Gravi- 

 tation. (See also Astro- 

 nomy 1050.) 84-86 



Gravitation 85-86 



Measurement of Dynamical and Me- 

 chanical Quantities. Elasticity. 



0800 General 86 



0805 Theory of Measurement (com- 

 bination of observa- 

 tions). Harmonic Ana- 

 lysis. Units and Dimen- 

 sions. Standards of 



Measurement 86-94 



For Theory of Measurement 

 (Combination of obser- 

 vations) see Mathe- 

 matics 1630 



Harmonic Analysis . . . 86-87 

 Units and Dimensions ... 87-88 

 Standards of Measurement 88-94 



Length 89-92 



Metre 90-91 



Mass 92-93 



Volume. ... ... ... 93 



Weights and Measures... 93-94 

 0807 Measurements of Curvatures, 

 Lengths (Mechanical 

 and Optical), Areas, 

 Volumes, Angles ... 94-100 

 Curvatures ... ... 94 



Lengths 94-98 



Areas [and cross sections], 

 (See also Mathematics 

 0080, Instruments.) 98-99 



Volumes 99 



Angles 99-100 



0809 Measurement of Time (me- 

 chanical and electrical) ; 

 Chronometers. (See also 

 Astronomy 2100.) 100-109 



PAGE 



Chronographs. (See also 



Mechanics 1650.) 101 



Chronometers ... 101-103 



Chronoscopes ... 103-104 



Clocks 104-107 



Compensation Pendu- 

 lum 104-105 



Electric Clocks ... 105 

 0810 Measurement of Mass and 

 Density. Balance. (See 

 also Chemistry 7115.) 109-119 



Mass 109-110 



Density 110-117 



Density of Gases ... 110 

 Density of Liquids 111-113 

 Hydrometers ... 111-113 



Density of Solids 114-115 



Density of Solids and 



Liquids ... ... 115 



Vapour Densities 115-117 



Balance 117-119 



0820 Measurement of Velocity, 

 Acceleration, Energy of 

 Visible Motion... ' 119-122 

 Measurement of Velocity 119-121 

 Rotation Velocity ... 120 

 Ships' Velocity... 120-121 

 Measurement of Accelera- 

 tion 121-122 



Measurement of Energy of 



Visible Motion 122 



0825 Measurement of Force ; Pen- 

 dulum, Spring-balance, 

 Torsion- balance. (See also 

 Astronomy 5100, Geology 



07.) 122-129 



Dynamometers ... 122-123 



Seismic Apparatus 124-128 

 Microseismometry ... 125 

 Pendulums ... 125-126 



Seismographs 126-127 



Seismometers... ... 127 



Seismoscopes ... ... 128 



0835 Measurement of Fluid Pres- 

 sure and Fluid Velocity. 

 (See also Mechanics 2830 

 and Meteorology 0310, 

 0312, 0314.) ... 129-133 



Manometers. (See also 



1450.) ... 129-130 



Pressure ... 131-132 



Velocity ... 132-133 



0840 Elastic Deformation of Solids. 

 Compressibility and Rigid- 

 ity. Elongation, Torsion, 

 Flexure, Young's Modu- 

 lus. (See Mechanics 3200 



to 3280.) 133-142 



Experimental determin- 

 ation of elastic con- 

 stants. (See also 



