Front, 1/87 from 1944
Front, 1/87 from 1952
Front, 1/87 from 1963
Front, 11/87
Front, 111/87
Back, 1/87 from 1952
Back, 1/87 from 1963
Back, 11/87
Back, 111/87
| Manufacturer: | A. W. Faber Castell | A. W. Faber Castell | A. W. Faber Castell | A. W. Faber Castell | A. W. Faber Castell |
| Model: | 1/87 | 1/87 | 1/87 | 11/87 | 111/87 |
| Production: | 1944 | 1952 | March 1963 | 1946 | Oct. 1963 |
| Length: | 29,5 cm | 30,2 cm | 30 cm | 30 cm | 29,9 cm |
| Material: | plastic on mahogani | plastic on mahogani | plastic on mahogani | plastic on mahogani | plastic |
| Scales: | |||||
| - Front: | cm, K, A [B, CI, C] D, L, 1:25 | cm, K, A [B, CI, C] D, L | |||
| - Back: | [S, ST, T] | ||||
| Condition: | moderate | good | good | moderate | good |
| Case: | two part, black paper-case | two part, green paper-case | one part, green and transparent plastic-case | one part, green and transparent plastic-case | two part, green paper-case |
| Cursor: | plastic, with 3 hairlines, broken | plastic, with 4 hairlines | missing | plastic, with 5 hairlines | plastic, with 5 hairlines, broken extensions |
| Extras: | no extras | no extras | no extras | no extras | no extras |
All five slide rules are System Rietz, and have a nearly identical order of scales. The 111/87 is the plastic version, the 1/87 and 11/87 are wood with plastic. The difference of the 111/87-series ist the material (plastic), the difference to the 11/87-series is not known by me. I appreciate any additional information.
The 1/87-series is the classical wooden Rietz-rule in three different variants, for a time of nearly 20 years. The scales are identical, all three slide rules have extensions to the left and right of the scales A/B, and C/D, The extensions and the CI-scale are printed in red. Among the centimeter-ruler at the top of the body is a ruler on a scale of 1:25 on the bottom of the body. A unit has the length of 4cm, which corrosponds to 1m. Apart from that, there are a few differences, especially the newest one has some changes. Its back is metal (on the wood) and the scales are self-explaining. The two older ones have no scale-marking or scale-explaination. On the back of all is an overview over importand constants. Both older have the same one, printed on paper and glued on the wood. The newer one has an updated version printed on the metal.
The slide rule 11/87 does not belong to the 1/87-series because of its model-number. I have not noticed any big differences (Update: According to information provided by Mr. Poschinger is the 11/87 build of laminated wood, without any metal inserts). The scales are identical, just as the hole design is very similar. This one is the only one with the mark "D.RG.M.", which stand for "Deutsches Reich Gebrauchs-Muster". This was something like a patent in the German empire. This is pretty interesting, as the slide rule was produced in 1946. The back of this one is also plastic on wood, on which the overview was printed. The content of the overview is identical to the content of early 1/87.
The series 111/87 is a further development of the System Rietz on plastic. Apart from the change from wood to plastic, and the little change of the propotions, are there only a few differences. The scale 1:25 is missing, and the overview on the back was updated.
Front, 1/87 from 1944 |
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Front, 1/87 from 1952 |
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Front, 1/87 from 1963 |
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Front, 11/87 |
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Front, 111/87 |
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Back, 1/87 from 1952 |
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Back, 1/87 from 1963 |
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Back, 11/87 |
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Back, 111/87 |
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