## The British encyclopedia, or, Dictionary of arts and sciences, Volume 3C. Whittingham, 1809 |

### From inside the book

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**Hence**all the glasses and glazes which contain lead , have the proper- ties of enamel , and what we may assert of the one will apply to the other with very little difference . Such are the white and transparent glazes of Dutch or Delft ... Page

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**hence**called sand - bags , are required for the support of the plate in engraving , which , from their circular sur- face , permits the copper to turn with ease , and facilitates the cutting of those true curves composing the shading of ... Page

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**hence**a : x : x :, or a = ya b , a mean proportional between u and b . Therefore upon a straight line take A B = a , and B C = 6 ; then upon the diameter AC describe a semicircle , and raise the perpendicular BD to meet it in D ; so ... Page

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**Hence**the other two roots are the roots of the quadratic x2 - x + 1 = 0 . If two roots , a and b , be obtained , the equation is divisible by x - axx - b , and may be re- duced in the same manner two dimensions lower . 23 - - Er . Two ... Page

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**Hence**, it appears , that there are nine values of ab , three only of which can answer the conditions of the equation , the others having been introduced by involu- tion . These nine values are , 1. a + b . q3 ; therefore a3 = --- 4 27 ...### Common terms and phrases

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