Model Metadata 

Taxonomy: 
Karlsruhe 
Group: 
Prismatic Return Mechanisms 
ID: 
UK031 
Title (English): 
Peaucellier Straightline Mechanism 
Title (German): 
Peaucellier´sche Geradführung 
Creator: 
Ferdinand Jacob Redtenbacher 
Date Created: 
18610000 
Manufacturer: 

Size: 
Overall: Width x Depth x Height [315, 120, 310] 
Medium: 
cast iron and brass on wood pedestal 
Rights: 
For educational use only. All rights reserved by the contributor(s) and publisher(s). 
Audience: 
General public 
Keywords: 

Description: 
This model of the Peaucellier straightline linkage is one of a class to have transformation mathematical properties known as geometric inversors.
The creation of linkages to produce straightline motion was an important engineering as well as a mathematical problem of the 19th century. This eightlink linkage was the one of the first to produce exact straight line motion and was independently invented by a French engineer named Peaucellier and by a Russian mathematician by Lipkin. It was used in various pressure indicators in stream engines as well as in machine tools.
Peaucellier was a graduate of the French Ecole Polytechnique and a captain in the French Corps of Engineers. While many engineers and mathematicians were searching for a 45 or 6 bar straight line linkage all suffered from the fact that they could not attain an exact straight line motion. Peaucellier looked at an 8 bar linkage and discovered he could generate not only an exact straight line motion from a rotary input, but could also generate an exact inverse function (one divided by the input) as well as an exact circular arc of large radius without using the center of the circle. This invention was recognized by several mathematicians as being very important to the design of general mathematical calculators.
The English mathematician James J. Sylvester spoke with wonder of how such an ingenious mechanism could be discovered as there was nothing leading up to it. He used the compounding of Peaucellier mechanisms to derive square root and cube root mechanisms. He saw no limit to the computing potential of linkages. 
Descr Author: 
Francis Moon 
Descr Date: 
20050000 