The Universal Preceptor: Being a General Grammar of Arts, Sciences, and Useful Knowledge ...A. Phelps, 1826 - 312 страница |
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Страница 18
... length , get the metal by itself in a pure state . 72. No one , on looking at most of the metallic ores , would suspect them to contain metal : they are appar- ently , the roughest , coarsest , and least desirable stones , or earths ...
... length , get the metal by itself in a pure state . 72. No one , on looking at most of the metallic ores , would suspect them to contain metal : they are appar- ently , the roughest , coarsest , and least desirable stones , or earths ...
Страница 20
... length and it may be beaten into leaves ; 300,000 of which , are only the thickness of an inch . 84. Silver is 11 times heavier than water ; and next to gold in beauty ; such is its ductility , that it may be drawn out in wire finer ...
... length and it may be beaten into leaves ; 300,000 of which , are only the thickness of an inch . 84. Silver is 11 times heavier than water ; and next to gold in beauty ; such is its ductility , that it may be drawn out in wire finer ...
Страница 24
... length , and the re- quisite crosses and ties may then be made without inequalities in the wall . 103. The first cement for walls , was either mud or clay ; but , in due time , experiment led to the preference of a mixture of lime ...
... length , and the re- quisite crosses and ties may then be made without inequalities in the wall . 103. The first cement for walls , was either mud or clay ; but , in due time , experiment led to the preference of a mixture of lime ...
Страница 29
... length are called the warp ; and are drawn tight by weights at one end ; at the other , they are divided into two sets , each set composed of alter- nate threads ; —on moving a treadle , one set , or every other thread , is thrown , up ...
... length are called the warp ; and are drawn tight by weights at one end ; at the other , they are divided into two sets , each set composed of alter- nate threads ; —on moving a treadle , one set , or every other thread , is thrown , up ...
Страница 30
... length of the warp has been interwoven with cross threads . Obs . 1. A figure of a simple loom is here given ; in which , the parts referred to above Day easily be traced . The forms of looms are , however , various , and often very ...
... length of the warp has been interwoven with cross threads . Obs . 1. A figure of a simple loom is here given ; in which , the parts referred to above Day easily be traced . The forms of looms are , however , various , and often very ...
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