The Universal Preceptor: Being a General Grammar of Arts, Sciences, and Useful Knowledge ...A. Phelps, 1826 - 312 страница |
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Страница 21
... metals . 93. Iron is formed into steel , by being heated with charcoal . Brass is composed of zinc and copper . Bell - metal is a mixture of tin and copper . Pewter is a mixture of tin and lead . Bronze is a mixture of cop- per and tin ...
... metals . 93. Iron is formed into steel , by being heated with charcoal . Brass is composed of zinc and copper . Bell - metal is a mixture of tin and copper . Pewter is a mixture of tin and lead . Bronze is a mixture of cop- per and tin ...
Страница 22
... metals . Obs .-- All that boys effect with lead and a tobbaco - pipe , men effect in regard to all the metals , by similar or slightly- varied means . 96. Civilization depends so much on the discovery of the useful metals , that little ...
... metals . Obs .-- All that boys effect with lead and a tobbaco - pipe , men effect in regard to all the metals , by similar or slightly- varied means . 96. Civilization depends so much on the discovery of the useful metals , that little ...
Страница 23
... metals , when the axe , the hammer , the saw , and the plane , became the tools of builders , it may be supposed , that houses would soon be raised to two stories , and increased in size and convenience . 102. To make artificial and ...
... metals , when the axe , the hammer , the saw , and the plane , became the tools of builders , it may be supposed , that houses would soon be raised to two stories , and increased in size and convenience . 102. To make artificial and ...
Страница 25
... metals , and of cer- tain coloured earths , or natural oxides , mixed with oil , at once serve to preserve wood , and to purify and beautify the inside of houses . VI . Of Architecture . 108. After the art of 3 BUILDING . 25 holes for ...
... metals , and of cer- tain coloured earths , or natural oxides , mixed with oil , at once serve to preserve wood , and to purify and beautify the inside of houses . VI . Of Architecture . 108. After the art of 3 BUILDING . 25 holes for ...
Страница 63
... metal given to a man to make one pin , he could scarcely do it in a day . In pin manufactories , however , each pin passes through twenty - five hands : one draws out the wire , another straightens it , another cuts it , another points ...
... metal given to a man to make one pin , he could scarcely do it in a day . In pin manufactories , however , each pin passes through twenty - five hands : one draws out the wire , another straightens it , another cuts it , another points ...
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