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K&E 4133 Family of Slide Rules

Scale sets :

Scale set #1 (1913-1922) for the 4133:

• cm/inch/A = B C = D|B&SGuage (the cm scale is on the back side opposing the inch scale.)
• = S L T =
• Inside under slide - CURRENT RATINGS
• L scale increases to the left.
• Three hairline cursor.
• Frame width = 23 mm

4133 --- 8" Roy Lance Electrical Slide Rule. No serial number. Early metal framed glass cursor with three hairlines.

Scale set #2 (1925-1936) for the N4133:

• inch/A = B CI C = D|B&SGuage
• = S L T =
• Inside under slide - CURRENT RATINGS
• L scale increases to the left.
• Three hairline cursor.
• Frame width = 28 mm

N4133 --- 8" Roy Lance Electrical Slide Rule. Serial number 155828. Replacement cursor with one hairline.

Scale set #3 (1936-1949) for the N4133:

• inch/A = B CI C = D K|B&SGuage
• = S L T =
• Inside under slide - CURRENT RATINGS
• Three hairline cursor.
• Frame width = 28 mm