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| 1739L |
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| DIETZGEN ARCHIVES |
| PAGE THREE |
| 10" |
| L, K, A[ B, CI, C ]D, LL1, LL2, LL3 T1, T2, DF[ CF, CI, C ]S, S, ST |
| 19 SCALES, 3 LOG-LOG SCALES |
| This is another slide rule supplied by FABER-CASTELL. This rule was sold with the name "CLEAR-SCALE". It is made from a 152/82, basically, but without "P" or "CIF". One of several supplied by Faber, this rule seems to have been targeted at students, just as was the 152/82. Blue accent stripes on some scales. |
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| Well that's pretty much it for 10" log-log rule types. Now on to the pocket log-log rules. This is a category where Dietzgen definately did NOT keep up with K+E. Whereas K+E made use of their plastic production facilities to manufacture the excellent 4181-1, and then the legendary pocket Deci-Lon 5, Dietzgen had no such factory. Thus, all the Dietzgen pocket log-log rules came from Germany. I've always thought it odd that with such diversity in the other rule types that they only had 3 pocket log-log rules. |
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| 1779 |
| 5" |
| "Pocket log slide rule, style M". |
| K, A[ B, L, C ] LL3, LL2, LL1 S, T, DF[ CF, CI, C ]D, P |
| 16 SCALES, 3 LOG-LOG SCALES |
| An unusual slide rule with a very unusual and distinctive scale layout. This rule, made by ECOBRA in Germany, appears in a list of available pocket sized slide rules in the back of the 1956 "decimal trig log-log" manual, such as came with the N1733 and similar rules. These are not common, and like the 10" rules from the same maker, often have flaking paint this many years later. Advertising angle implied a standard type pocket rule with 3 log scales and a "P" scale added. |
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| 1773 |
| "log-log pocket slide rule-- all plastic" |
| L, K, A[ B, CI, C ]D, P, S, T [ LL1, LL2, LL3 ] |
| 5" |
| 13 SCALES, 3 LOG-LOG SCALES |
| This rule is the familiar FABER-CASTELL Darmstadt model 67/54b, but re-labelled for DIETZGEN. Also listed in the back of the 1956 manual mentioned above, the ad copy says that the 1773 " ...can be used for all types of engineering and scientific calculations, yet is no larger than a pocket comb." The other rule appearing in this list is the 1771 REDI-RULE. |
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| 1778 |
| 5" |
| "REDI-LOG" model. Plastic adjustable duplex. |
| L, T1, T2, A[ B, BI, CI, C ]D, ST, S, P LL03, LL02, LL01, K[ K', C, CIF, CF ]DF, LL1, LL2, LL3 |
| 24 SCALES 6 LOG-LOG SCALES |
| This is the largest, most powerful pocket log-log slide rule ever offered by DIETZGEN to my knowledge. This is a re-labelled FABER-CASTELL 62/82 model. One of the few slide rules sold in the U.S. with a "BI" scale, or two "K" scales for that matter. Not common at all. Like the above 1739L, used blue accent stripes on some scales. |
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| And there we have all three known pocket log-log types. Now on to duplex NON log-log rules, both 10 and 5 inch. This part of the list is nowhere near complete, as I am sure many older models are so infrequently seen that I am missing some. Nevertheless, most of the "modern" or late types are here, and these are the ones seen most often by today's collectors. |
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| 1744 |
| 10" |
| Polymath Multiplex |
| K, A[ B, T, ST, S ]D, DI DF[ CF, CIF, CI, C ]D, L |
| 15 SCALES |
| Latest, most powerful non log-log duplex rule sold by Dietzgen. Believed to have been introduced around the time the N series rules came out, hence use of the "polymath" name. Takes the scale layout of the 1746 and adds ST and DI, and moves K. Relatively uncommon. |
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| 1746 |
| 10" |
| Maniphase Multiplex |
| A[ B, S, T ]D, K DF[ CF, CIF, CI, C ]D, L |
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| 13 SCALES |
| Second largest duplex, preceeded the 1744 in production. Relatively common compared to the 1744, but both seem to be less common than their contemporary log-log types. |
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