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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Disk
560
Boykin
U.S.A (Maryland)
Plastic
est 1960 to 1970
Diam 13 cm
General Purpose
Notes:
"1) Spirial scale = 127 cm, 24 scales total both sides including a stadia scale, leather case and optional bar magnifier, 2) The trignometric scales on the 560 split degrees into minutes, the 510 split degrees into decimals"
Image 1
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Image 4
