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1<?php
2        $seiten_id = 'elektro-mechanik';
3        $version = '$Id: electro-mechanical.php 883 2015-11-26 22:12:33Z heribert $';
4        $title = '(Electro-) mechanical calculators';
5       
6        require "../../lib/technikum29.php";
7?>
8    <h2>Mechanical Adding Machines</h2>
9
10        <div class="box left clear-after">
11        <img src="/shared/photos/rechnertechnik/efzet.jpg" width="447" height="433" alt="EFZET Slide Rod Calculator" />
12                <p class="bildtext">
13                        For the sake of completeness, we mention the predecessors of the electro-mechanical calculators: pure
14                        mechanical "pocket calculators" of the early days. The picture on the left shows a small slide rod calculator
15                        from "Produx". This handy device <i>Efzet</i> was intended
16        </p>
17        <blockquote>for the buisenessman, industrial, craftsman, engineer, student and even the housewife</blockquote>
18                <p>
19                like the <a href="/en/devices/efzet.php" class="en">instruction sheet</a> (german only) tells.
20                        This device does not seem to be very useful.
21                </p>
22        </div>
23
24    <h2>(Electro-) mechanical calculators</h2>
25   
26
27<div class="box left clear-after">
28        <img src="/shared/photos/rechnertechnik/burroughs.jpg" width="447" height="606" alt="Borroughs Mod.2" />
29        <p class="bildtext">
30
31   <p>
32            The first electronically calculating calculators were gigantic mainframes
33        in the 1940/50s. Until then, calculators worked mechanically.
34        When the handwheel was replaced by an electric engine, the era of mechanical
35            calculators began.
36        </p>
37    <p>
38            <!--The first printing mechanical calculator (1905) is an unicum with an huge exterior engine!-->
39               
40                From the first fully automatic machines (1927) until calculators with
41                accumulating memory (1960s), mechanical calculators computed the result
42                indepently after user input.
43                Curta I, The world's first "pocket calculator", has 1/3 from the volume of a
44        Coca Cola-pin and is consequently the smallest four-species machine ever built.
45                Looking at mechanical calculators, one quickly recognize the enormous
46                importance of the positional notation.</p>
47               
48        <p>
49           <b>Burroughs Mod. 2.</b>
50           The first printing calculating machine was invented in the USA (about 1905)
51                   and was selled worldwide. It features a complete keyboard for 17 digits, a
52                   printing unit and a long carriage for the sheet paper. The device could be
53                   used as a simple electronic accounting machine. At that time the engines
54                   could already be built just compact enough for such a device. Anyway, the
55                   huge engine (for today's circumstances) had to be placed below the device
56                   (on the right hand side in the picture). The sack below the engine is
57                   intended for collecting the leakage oil.
58        </p>
59    </div>
60
61    <div class="box right clear-after">
62        <img src="/shared/photos/rechnertechnik/madas1.jpg" width="600" height="373" alt="Madas Rechenmaschiene" />
63        <p class="bildtext"><b>MADAS</b>, an electromechanical calculator from 1927
64        made by the calculating machine factury "Egli AG" in Zurich.
65                Since multiplying and dividing needs some time, the inventors installed a small
66                bell (at the upper left) that rings after the calculation has finished.</p>
67    </div>
68
69    <div class="box left clear-after">
70        <img src="/shared/photos/rechnertechnik/rheinmetall.jpg" width="600" height="499" alt="Rheinmetall Superautomat" />
71        <p class="bildtext">In 1932, <b>Rheinmetall</b> extended an adding machine with
72                  a surface mounting, thus creating a 4-species calculating machine.
73          The comfortable usability seems to be the reason why they called it "Superautomat".
74                  Calculating is the only ability of this colossus.
75                </p>
76    </div>
77       
78        <div class="box right clear-after">
79        <img src="/shared/photos/rechnertechnik/curta.jpg" width="500" height="489" alt="Curta I and Curta II" />
80            <p class="bildtext">
81                    <b>Curta I and Curta II</b>
82                        <br>These outstanding small pocket calculators were produced almost
83                        unmodified from 1948 to ca. 1971. This is unbelievable for today's
84                        technology products. The Curta could perform all basic arithmetic
85                        operations.
86                        Packing all the complex mechanics into such a small volume was an enormous
87                        challenge. For comparision of the sizes, we put a matchbox from the same
88                        era on the picture.
89                        <br>The Internet is full of literature about the Curta, e.g. the
90                        <a href="http://www.vcalc.net/cu-bckup.htm">story about inventor Curt
91                        Herzstark</a>.
92                </p>
93    </div>
94
95        <div class="box right clear-after">
96        <img src="/shared/photos/rechnertechnik/diehl-vsr18.jpg" width="500" height="375" alt="DIEHL VSR-18" />
97        <p class="bildtext"><b>DIEHL VSR-18</b>, one of many mechanical calculators
98        built between 1955 and 1965.
99        <br/>The engineers were hardly pressed to design better and better machines, until
100        the limit of feasibility. So the operating instructions say: "This DIEHL-device VSR
101        performs outstanding work". That is really true: For example, one were able to
102        cache results and to transfer back them anytime you want to. With this feature
103        daily calculations like 25 + 12 x 7 - 17 x 6 could be solved without notating
104        anything. However, this luxury still had a drawback: Maloperation could damage the
105                whole device.</p>
106    </div>
107       
108         <div class="box left clear-after">
109        <img src="/shared/photos/rechnertechnik/kids-rechnen-mechanisch.jpg" width="448" height="336" alt="Kid´s beim Exp.-Workshop" />
110        <p class="bildtext">Hands-on-workshop: It is a challenge for kids and young adults to perform a
111division operation with mechanical devices.</p>
112                </div>
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