Changeset 124 in t29-www for en/computer/analog.shtm
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- Nov 13, 2009, 12:27:02 AM (14 years ago)
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en/computer/analog.shtm
r93 r124 172 172 This computer was built in the early 1970s and was priced at 80.000 DM (about 40.000 euro/dollar) 173 173 </p> 174 <div class="clear"></div> 174 175 </div> 176 177 <div class="box center"> 178 <h3 class="center">(Cylindrical) slide rules</h3> 179 <img src="/shared/photos/rechnertechnik/rechenschieber.jpg" 180 alt="Slide rule (slipstick) and Cylindrical slide rule" width="694" height="161"/> 181 <p class="bildtext"> 182 Last but not least a mechanical analog computer that was used up to 183 the 1970s for scientific calculations without hand and desk calculators. 184 <br/>The picture above displays a 1.8m long demo slide rule 185 made of wood (1950s) that was used in schools for students since the 186 10th grade. Compared to hand calculators, these analog computers 187 also had some advantages: Students could not give absurd computing 188 precisions, these "computers" were cheap and quite fast. The big 189 disadvantage was that adding and subtracting was not possible at all. 190 <br/>To get higher precisions in the 1920s, there was this 191 "Cylindrical slide rule". This 60cm NESTLER device can be compared 192 to an ordinary slide rule measuring 12.50m. 193 </p> 194 </div> 175 195 176 196 </div><!-- end of content -->
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