Archive of Collections



Details and Image



TypeModel No.MakerCountryConstruction
Material		DateScale LengthArea of Use
Disk
510
BoykinU.S.A (Maryland)
Plastic
est 1960 to 1970Diam 13 cmGeneral Purpose

Notes: "Spirial scale = 127 cm, 24 scales total both sides including a stadia scale, leather case, one image shows optional bar magnifier, one image shows parts, one image shows stamped markings prior to inking. Note 3rd and 4th images are of a 510 w/o magnifier."


Image 1




Image 2




Image 3




Image 4




Image 5




Image 6




Image 7