<div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">Dear colleagues:</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">The Italian engineer Roberto Guatelli was a world-famous model maker. </div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">He built many models based on the drawings of<i> <font color="#ff0000">Leonardo da Vinci</font></i> for IBM New York.</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">Moreover, he made replicas of important historical calculating devices:</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">machines of <font color="#ff0000"><i>Pascal, Leibniz, Babbage, Hollerith </i></font>and Steiger/Egli (Millionaire).</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">Several replicas are preserved in collections in New York, Ottawa, Mountain View, Pittsburgh, and Milan.</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">I am very grateful for information on additional replicas:</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">a) Did Guatelli build replicas of other calculating machines? Which?</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">b) Have these replicas survived?</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">c) Where are these replicas?</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">d) Do you know more about Guatelli's life?</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">Many thanks for your help!</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">Best,<br>Herbert</div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;"><br></div><div style="text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: trebuchet ms; font-style: normal; font-variant: normal; font-weight: 400; text-decoration: none; word-spacing: 0px; white-space: normal; orphans: 2; -webkit-text-stroke-width: 0px; background-color: transparent;">
<p align="left" style="line-height: normal; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: left;"><i><span lang="EN-US" style="color: rgb(0, 0, 0); font-family: "Times New Roman","serif"; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;">Communications of the ACM:</span></i></p>
<p style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;"><b><span lang="EN-US" style="color: rgb(0, 0, 0); font-family: "Times New Roman","serif"; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;">The Model Maker of Leonardo da Vinci,
Blaise Pascal, and Charles Babbage</span></b><b><span lang="EN-US" style="font-family: "Times New Roman","serif"; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;"></span></b></p>
<p align="left" style="line-height: normal; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: left;"><span lang="DE-CH" style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;"><a href="https://cacm.acm.org/blogs/blog-cacm/233366-the-model-maker-of-leonardo-da-vinci-blaise-pascal-and-charles-babbage/fulltext"><span lang="EN-US" style="font-family: "Times New Roman","serif"; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;"><font color="#0000ff">https://cacm.acm.org/blogs/blog-cacm/233366-the-model-maker-of-leonardo-da-vinci-blaise-pascal-and-charles-babbage/fulltext</font></span></a></span><span lang="EN-US" style="color: rgb(0, 0, 0); font-family: "Times New Roman","serif"; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;"></span></p>
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<p align="left" style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: left;"><b><span style="margin: 0px;">Meilensteine der Rechentechnik, volume 1</span></b></p>
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<p align="left" style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: left;"><b><span style="margin: 0px;">Meilensteine der Rechentechnik, volume 2</span></b></p>
<p align="left" style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; text-align: left;"><span lang="DE-CH" style="margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px;"><a href="https://www.degruyter.com/view/product/503373"><span lang="DE" style="margin: 0px;"><font color="#0000ff">https://www.degruyter.com/view/product/503373</font></span></a></span><span style="margin: 0px;"></span></p>
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