
Dietzgen Rules
Hi Rod, I have Overhead Projection Rules by FC and by Aristo in very good conditions and with docs. I have also Classroom Demonstration Ruler by FC, 2 m long. Maciej pt., 12 lut 2021 o 13:45 Rod Lovet
Hi Rod, I have Overhead Projection Rules by FC and by Aristo in very good conditions and with docs. I have also Classroom Demonstration Ruler by FC, 2 m long. Maciej pt., 12 lut 2021 o 13:45 Rod Lovet

By
Maciej M. Sysło
· #1268
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Faber Castell 2/84 Mathema
Hi Rod, ,could you estimate the price of FC 2/84 Best regards, Maciej niedz., 24 sty 2021 o 14:45 Rod Lovett <rod@...> napisał(a):
Hi Rod, ,could you estimate the price of FC 2/84 Best regards, Maciej niedz., 24 sty 2021 o 14:45 Rod Lovett <rod@...> napisał(a):

By
Maciej M. Sysło
· #1260
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Offtopic: Discrete mechanical calculators  the "loglog" type / fouroperation machines
... it follows from: (n + 1)^2 = n*2 + (2n + 1) m śr., 19 sie 2020 o 12:11 Maciej M. Sysło via groups.io <syslo@...> napisał(a):
... it follows from: (n + 1)^2 = n*2 + (2n + 1) m śr., 19 sie 2020 o 12:11 Maciej M. Sysło via groups.io <syslo@...> napisał(a):

By
Maciej M. Sysło
· #1088
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Offtopic: Discrete mechanical calculators  the "loglog" type / fouroperation machines
Hi Gabriel, It was already used by Babbage in his notfinished difference engine that a square of an integer is equal to the square of the previous integer plus a consecutive odd integer. 1^2 = 1 = 0
Hi Gabriel, It was already used by Babbage in his notfinished difference engine that a square of an integer is equal to the square of the previous integer plus a consecutive odd integer. 1^2 = 1 = 0

By
Maciej M. Sysło
· #1087
·


Extremely Rare Flynn Universal Trigonometric SemiCircular Slide Rule
Any 2/84N available for 50 Euro? Maciej pon., 17 sie 2020 o 22:06 Andreas Poschinger <andreas.poschinger@...> napisał(a):
Any 2/84N available for 50 Euro? Maciej pon., 17 sie 2020 o 22:06 Andreas Poschinger <andreas.poschinger@...> napisał(a):

By
Maciej M. Sysło
· #1067
·


Extremely Rare Flynn Universal Trigonometric SemiCircular Slide Rule
Dear Andreas, I uploaded two scans of the pamphlet. You can see what kind of problems they were involved in. First, they had to remind themselves that a circle has 360 degrees, an hour has 60 minutes,
Dear Andreas, I uploaded two scans of the pamphlet. You can see what kind of problems they were involved in. First, they had to remind themselves that a circle has 360 degrees, an hour has 60 minutes,

By
Maciej M. Sysło
· #1060
·


Extremely Rare Flynn Universal Trigonometric SemiCircular Slide Rule
Hello Andreas, I uploaded to TrigEasy folder 3 pictures of other slidedevices for trigonometry. Note, they were designed as educational tools for defence workers; they usually have a hard time with
Hello Andreas, I uploaded to TrigEasy folder 3 pictures of other slidedevices for trigonometry. Note, they were designed as educational tools for defence workers; they usually have a hard time with

By
Maciej M. Sysło
· #1057
·


Discrete calculator machines vs. logarithmic rules: Early and later relevance?!
Hi Andreas, I remember my colleagues at the end of 1960s from a technical university who had to use SRs for calculating their projects in various technical disciplines. I graduated in math from a univ
Hi Andreas, I remember my colleagues at the end of 1960s from a technical university who had to use SRs for calculating their projects in various technical disciplines. I graduated in math from a univ

By
Maciej M. Sysło
· #1047
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Off topic: Discrete calculator machine replica
Hi, here: https://www.ebay.pl/itm/SuperbemachineacalculerdeWSchickard1623rechenmaschinecalculator/324197844052 you can see another replica of Schickard's machine, much cheaper. and I attach a
Hi, here: https://www.ebay.pl/itm/SuperbemachineacalculerdeWSchickard1623rechenmaschinecalculator/324197844052 you can see another replica of Schickard's machine, much cheaper. and I attach a

By
Maciej M. Sysło
· #1043
·


American Slide Rules
Fantastic! maciej czw., 12 mar 2020 o 21:14 Rod Lovett <rod@...> napisał(a):
Fantastic! maciej czw., 12 mar 2020 o 21:14 Rod Lovett <rod@...> napisał(a):

By
Maciej M. Sysło
· #375
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Calculators
Hi Andreas, I would suggest to initiate two groups: mechanical calculators (like Pascalina) and electronic calculators. I will join the former one. Maciej wt., 29 paź 2019 o 22:41 Andreas Poschinger <
Hi Andreas, I would suggest to initiate two groups: mechanical calculators (like Pascalina) and electronic calculators. I will join the former one. Maciej wt., 29 paź 2019 o 22:41 Andreas Poschinger <

By
Maciej M. Sysło
· #130
·
