Date   
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #706 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #707 ·
P scale -- Faber Castell 62-83 By Andreas Poschinger · #709 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #715 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #717 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #720 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #721 ·
Light into Darkness: Did Partridge publish the logarithmic duplex slide rule in 1661? Bissaker the first straight slide rule? By Andreas Poschinger · #722 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #723 ·
Priority: Who invented the slide rule? By Andreas Poschinger · #731 ·
Priority: Who invented the slide rule? By Andreas Poschinger · #733 ·
Priority: Who invented the slide rule? By Andreas Poschinger · #737 ·
Priority: Who invented the slide rule? By Andreas Poschinger · #741 ·
Priority: Who invented the slide rule? By Andreas Poschinger · #743 ·
Light into Darkness: Delamain's Grammelogia ("edition 2", Henry E. Huntington Library and Art Gallery ) By Andreas Poschinger · #746 ·
Sector: how to use? By Andreas Poschinger · #747 ·
Sector: how to use? By Andreas Poschinger · #749 ·
Sector: how to use? By Andreas Poschinger · #759 ·
Sector: how to use? By Andreas Poschinger · #762 ·
Tick Mark Catalog? By Andreas Poschinger · #776 ·
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