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--- summap20 [2016/02/10 21:21]
clodoveu
+++ summap20 [2017/05/14 18:27] (current)
clodoveu
@@ Line 2: / Line 2: @@
 * [[etc|Back to Offline Hours]]
+* [[calc|Back to Mechanical Calculators]]
 These are actually two machines: one with square keytops, and another with round ones. Both were manufactured in Argentina. There are still many Summa Prima 20s around, some made in Brazil.
@@ Line 11: / Line 13: @@
 I found the repair of these machines much harder than any other I have. Whether I'll succeed or not in making the square-keytop work or not, remains to be seen. Their mechanism is much smaller, tighter, and apparently not very modular. Suffice to say that the Summa Prima 20 weighs half as much as the Summa 15, its predecessor.
-Round keytop as purchased, in February 2016.
+Update: In May 2017, I finally got around to a revision in the round-keytop one, lubricating critical points, polishing the plastic cover, repainting the keyboard plate, the joystick dial, and the purple bottom.
+Front view, restored keyboard plate and joystick dial
+{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/20170514_Summa_Prima_20_front.jpg?500 | Front}}
+Left side
+{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/20170514_Summa_Prima_20_left_side_1.jpg?500 | Left side view after restoration}}
+Left side, notice the restored purple bottom and the overall aspect of the machine, as compared to the other picture, showing the right side as purchased.
+{{http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/20170514_Summa_Prima_20_left_side_2.jpg?350 | Left side view after restoration }}
+{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-2.jpg?350 | Right side view, as purchased}}
+Right side
+{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/20170514_Summa_Prima_20_right_side_1.jpg?500 | Right side}}
+Top view
+{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/20170514_Summa_Prima_20_top.jpg?500 | Top}}
+Back view, made in Argentina
+{{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/20170514_Summa_Prima_20_back.jpg?500 | Back}}
+As purchased, in February 2016.
 {{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-1.jpg?500 | As purchased}}
@@ Line 17: / Line 46: @@
 Olivetti ads for the Summa Prima 20 remind me of the TV series "Mad Men"
-{{http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-ad1.jpg?200 | Ad 1}}
+^^^^
-{{http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-ad2.jpg?200 | Ad 2}}
+| {{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-ad1.jpg?200 | Ad 1}} | {{ http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-ad2.jpg?200 | Ad 2 }} | {{http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-ad3.jpg?200 | Ad 3 }} |
-{{http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/SummaPrima20-ad3.jpg?200 | Ad 3}}
+**More on this machine**
+[[http://www.aconit.org/histoire/calcul_mecanique/documents/Olivetti_Summa_Quanta_20.pdf | An explanation of the design of the Summa Quanta 20, an electrical machine similar to the Summa Prima 20, a successor to the Summa 15. The calculating principle is the same]]
+[[http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/Olivetti Summa Prima 20 Quick Reference Guide (Spanish).pdf|Olivetti Summa Prima 20 quick reference guide, in Spanish]]
-MORE PICTURES
+[[http://www.dcc.ufmg.br/~clodoveu/files/Images/SummaPrima20/Olivetti Summa Prima 20 User Manual (Italian)|Olivetti Summa Prima 20 User's Manual, in Italian]]
-to appear
 **Have a mechanical calculator stored somewhere, and want to get rid of it? Send it to me!**

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summap20.1455146492.txt.gz · Last modified: 2016/02/10 21:21 by clodoveu

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