Nestler Star Slide Rule & Reference Tables (Note: this description is still under construction!)

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Country of manufacture: Germany,            Date of manufacture: c 1913
Overall length: 27.6 cm,     Width: 5.9 cm,      Weight: 146.8 gms
Materials: Celluloid scales screwed or glued onto mahogany; book consists of heavy paper or cardboard pages.
Cursor: 2.2 X 4.3 X 1.5 cms; metal framed extendable plastic lens; lines = three, defining areas designated as 'E' and 'H'
Scales: 13 on body and cover of rule, more on pages of book; many specialized
Book Cover Front: 25 cm // Kg
Front: ?, ? (these first two 2 scales are covered by the Kg scale on the Book Cover when it is closed) [?, ?, C ] D || n², L
Slide Back: U, F
Well: 28-53 cm
Gauge Marks: [π, C (1128), ρ" (2063), ρ' (3438), C' (3568), ρ,, (6366) ]
Back of Rule: Blank
Condition: C4-C5 (signs of Minimal to Normal Use)
Came with: Nothing
Note: The book portion of the device may be opened when the plastic cursor lens is retracted downward past the scale on the cover labelled 'Kg'

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Front View, and Side View with rule/book opened
 
Full Slide Front (Note that the top 2 scales on the slide are not visible when the book is closed because they are covered by the Kg scale on the book cover)

Bottom Edge

Back

Back of Slide

Well

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All the pages of the book are shown below.
All pages except 0 (the first image) and XIII (the last image) contain tabular or graphic data which may be accessed and used with the cursor in its extended position.
To illustrate this, the 4th image shows the cursor extended over data rows shown on image 3, and the 7th image shows the cursor extended over the data rows on image 6.