Timetable slide ruler

Timetable Slide Ruler. 16 1/2"x2"x1/2".

Details

Category:
Tools of the Trade & Personal Accessories
Object Number:
1988-7508
Measurements:
overall: 16 1/2 in x 2 in x 1/2 in,
type:
ruler
credit:
British Rail, Historical Relics