EXPLANATION of CHARACTERS* 



SIGNIFIES eqitalitf: as 20 sKilllngS rr i pound, sig- 

 nifiesj that 20 shillings are equal to one pound. 



-j- Signifies plusy or addition : as, 4 -}- 2 zr 6. 



— Signifies minus, or subtraction : as, 6-— 2ZZ4. 



X Ifito^ signifies multiplication : as, 3 X 2 rz 6, 



-r- By, or ) ( signifies division : as, 6 -^ 2 zr 3, or 

 2)6(3. 

 Division may alfo be denoted by placing the dividend 

 I overaline, and the divisor under it: thus^iz:6-r- 2Z13. 



•" : : •• Signifies arithmetical proportion : thus 2 •• 4 : : 6 •• 8; 

 here the meaning is, that 4—211:8 — 6zi2. 



; : : : Signifies geometrical proportion : thus 2:41:3:6, 

 which is to be read, as 2 to 4, fo is 3 to 6. 



^ Signifies arithmetical progression* 



-j^ Signifies continual geometrical proportion, or geometrical 

 progression, 



p*. Signifies therefore, 



-~i* Signifies /^^ second power, or square, 



•^^ Signifies /^^ /i??/Vi power, or fw^^. 



-^l"* Signifies tf«;j power, 



V^, or — 1^, Signifies /i?)^ /^r/jr^ rr^/, 



B 



