Title
Rolling parallel rule in wooden caseCatalog Number
B105.80Type
Physical objectDate
undatedManufacturer
W. H. Harling Ltd.Place Manufactured
London, EnglandIdentifying Numbers
| Other number | Patent No. 160100 |
Dimensions
1 3/4 x 19 x 4 3/4 in. (box); 1 x 18 x 2 1/2 in. (ruler)Category
Pre-computer/slide ruleCollection Title
Gwen Bell artifact and book collectionSeries Title
Pre-computing artifactsLot Number
B105.80