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Rulers of ancient empires built roads , which fostered commerce and communication . But the principal purpose of these roads , as of the governmental postal systems that operated over them , was to keep a swift stream of commands and ...
For , in the ancient world , an invention could be lost and rediscovered several times . The numbers of engineers and inventors were extremely small compared to those of today . Inventors often tried to keep their inventions secret ...
The ancients used lead not only for piping but also for kitchen utensils . Furthermore , leaden vessels were used in making wine , and the stoppers on jars were sealed with a cement containing red lead . As a result , some students ...
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LibraryThing ReviewCrítica de los usuarios - PDCRead - LibraryThing
This was originally written in 1962, and is therefore is a little dated. Sprague de Camp has written a book all about the different civilisations and the technologies that that invented or acquired ... Leer comentario completo
LibraryThing ReviewCrítica de los usuarios - Schmerguls - LibraryThing
5609. The Ancient Engineers, by L. Sprague De Camp (read 21 Jan 2019) This book was first published in 1963 and hence its bibliography includes nothing after that date. It undertakes to tell of the ... Leer comentario completo
One The Coming of the Engineers
Three The Mesopotamian Engineers
Four The Greek Engineers
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