## Illustrations of the Centimetre-gramme-second (C.G.S.) System of Units: Based on the Recommendations of the Committee Appointed by the British Association "For the Selection and Nomenclature of Dynamical and Electrical Units.". |

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### Common terms and phrases

atmosphere Brass C.G.S. system C.G.S. units capacity of unit centrifugal force coefficient of elasticity compression conductivity Copper cubic centim cubic centimetre Daniell's cell defined denote dimensions dry air dynes per square electromagnetic units electromotive force electrostatic unit employed equal equation ergs farad following are reduced formula g being 981 German silver given gramme gramme-degree heat required height Hence inch intensity of magnetization Iron kilogramme liquid mass of water mean megadyne per square mercury metre millimetre multiplied numerical value place where g platinum pole pound Professor quantity of electricity quotient radius ratio required to raise resistance Sidereal day Simple Rigidity specific gravity specific heat specimen square centim stress substance Temp thermal capacity unit acceleration unit mass unit of area unit of force unit of heat unit of length unit of mass unit of quantity unit volume unity vacuo value of g Volume-elasticity wire Young's modulus Zinc

### Popular passages

Page 84 - ... the metre, and the second, as against the gramme, the centimetre, and the second, — the former combination having an advantage as regards the simplicity of the name metre, while the latter combination has the advantage of making the unit of mass practically identical with the mass of unit- volume of water — in other words, of making the value of the density of water practically equal to unity. We are now all but unanimous in regarding this latter element of simplicity as the more important...

Page 59 - The work required to move a pole P from one point to another, is the product of P by the difference of the magnetic potentials of the two points. Hence, the dimensions of magnetic potenml

Page 39 - The maximum theoretical temperature evidently depends upon the quantity of heat developed by the combustion of a unit weight of the gas and upon the quantity of heat required to raise, by one degree, the temperature of the products resulting from the combustion of this unit weight, and the quotient obtained by dividing the...

Page 85 - For multiplication or division by a million, the prefixes mega* and micro may conveniently be employed, according to the present custom of electricians. Thus the megohm is a million ohms, and the microfarad is the millionth part of a farad. The prefix mega is equivalent to the affix six. The prefix micro is equivalent to the prefix sixth. The prefixes kilo, hecto, deca, deci, centi, milli can also be employed in their usual senses before all new names of units.

Page 86 - CGS unit of power is the power of doing work at the rate of one erg per second ; and the power of an engine, under given conditions of working, can be specified in ergs per second. For rough comparison with the vulgar (and variable) units based on terrestrial gravitation, the following statement will be useful : The weight of a gramme, at any part of the earth's surface, is about 980 dynes, or rather less than a kilodyne. The weight of a kilogramme is rather less than a megadyne, being about 980,000...

Page 67 - Now yp is clearly the value in centims. per second of that velocity which would be denoted by unity in the new system. This is a definite concrete velocity ; and its numerical value will always be equal to the ratio of the electromagnetic to the electrostatic unit of quantity, whatever units of length, mass, and time are employed.

Page 85 - Stoney, a system which has already been extensively employed for electrical purposes. It consists in denoting the exponent of the power of 10, which serves as...

Page 59 - But we have volume * Hence intensity of magnetization has the same dimensions as intensity of field. When a magnetic substance (whether paramagnetic or diamagnetic) is placed in a magnetic field, it is magnetized by induction ; and each substance has its own specific coefficient of magnetic induction...

Page 87 - For exact comparison, the value of g (the acceleration of a body falling in vacuo) at the station considered must of course be known. In the above comparisons it is taken as 980 CGS units of acceleration.

Page 58 - The intensity of a magnetic field is the force which a unit pole will experience when placed in it. Denoting this intensity by I, the force on a pole P will be IP. Hence IP = force = MLT--, I = that is, the dimensions of field-intensity axe 156.