Das vorliegende Schriftehen ist die Wiedergabe eines Vortrages, welchen der Unterzeichnete in der 25. Haupt- versammlung des Vereines deutsch er Ingenieure zu Mannheim am 1. September 18R4 zu halten veranlasst worden war und welcher darauf in der Zeitschrift dieses Vereines gedruckt worden ist. Einigen geaufserten Wunschen hat die Verlagsbuchhandlung in freundlicher Weise entsprochen, indem sie einen Sonderabdruck des Artikels veranlasst hat in welchem die Tafeln behufs der Verwendung im Zeichen- bureau auf starkeres Papier gedruckt sind. Aachen, den 1. December 1884. Gustav Herrmann. Wenn ich die mechanische Warmetheorie zum Gegen- stande meiner Betrachtung gewahlt habe, so geschah dies, weil ich glaubte, in den Kreisen der Ingenieure einiges Inter- esse hierfur voraussetzen zu sollen; wenigstens durften zu diesem Glauben die verschiedenen Veroeffentlichungen be- rechtigen, welche in neuerer Zeit in der technischen Lite- ratur uber Gegenstande zu finden sind, die mit der mecha- nischen Warmetheorie Im engen Zusammenhange stehen. Obwohl die glanzenden Ergebnisse dieser Wissenschaft, mit welchen die Namen der bedeutendsten Forscher auf dies. em Gebiete verknupft sind, den Gegenstand der Be- handlung verschiedener, grofsenteils trefflicher Lehrbucher ausmachen, und obgleich heutzutage wohl an allen tech- nischen Hochschulen ein besonderer- Vortrag dieser Materie gewidmet ist, so findet sich doch im grofsen und ganzen in den Kreisen der Ingenieure nicht immer diejenige Klarheit der Anschauungen vor, welche bei einem fur die ganze Tech- nik so bedeutenden Gegenstande zu wunschen ist.

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

This is a pre-1923 historical reproduction that was curated for quality. Quality assurance was conducted on each of these books in an attempt to remove books with imperfections introduced by the digitization process. Though we have made best efforts - the books may have occasional errors that do not impede the reading experience. We believe this work is culturally important and have elected to bring the book back into print as part of our continuing commitment to the preservation of printed works worldwide.

This is an EXACT reproduction of a book published before 1923. This IS NOT an OCR'd book with strange characters, introduced typographical errors, and jumbled words. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

This is a pre-1923 historical reproduction that was curated for quality. Quality assurance was conducted on each of these books in an attempt to remove books with imperfections introduced by the digitization process. Though we have made best efforts - the books may have occasional errors that do not impede the reading experience. We believe this work is culturally important and have elected to bring the book back into print as part of our continuing commitment to the preservation of printed works worldwide.