| Emil Tröger model 2 | |
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| Diameter | 29 cm |
| Number of scales | 3 |
| Country of origin | Germany |
| Country of manufacturing | Germany |
| Year of manufacturing | 1910-1920? |
| Status of the slide rule | Normal signs of use |
| Material of the slide rule | Cardboard |
| Type of cursor | Metal with plastic |
| Status of the box | None |
| Status of the manual | None |
| Collection number | 13 |
| Further comments | A very simple calculator. The inner light part of the disk can turn independently from the outer ring. It is a model 2, which is however virtually indistinguishable from a model 1 on shown on http://www.hh.schule.de/metalltechnik-didaktik/users/luetjens/rechenschieber/scheiben/rs9.htm. Peter Hopp's book only mentions model 1. |
