MakerModel No./Type SectionsApprox
Date		Effective
Scale
Length (cms)		Data Source
Table III Long Scale Devices with Gunter Lines, Gridirons and Graphical Charts & Tables
LaFayPetite Table Graphique de Logarithmes
10
c1930s
250
Chamberlain collection & Lafay [undated]
MakerModel No./TypeSectionsApprox
Date		Effective
Scale
Length (cms)		Data Source
Table VIII Long Scale Cylindrical Slide Rules with helical windings
LaFayHelice a Calcul #1
20
1931
85
Chamberlain Collection
LaFayHelice a Calcul #2
50
1931
250
Chamberlain Collection
LaFayHelice a Calcul #2bis
25
1931
125
LaFay 3 references]


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