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Pickett Model N 3: Difference between revisions
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==== Back ==== | ==== Back ==== | ||
LL0± LL1± DF (CF CIF Ln/L CI C) D LL2± LL3± | LL0± LL1± DF (CF <span style="color:red">CIF</span> Ln/L <span style="color:red">CI</span> C) D LL2± LL3± | ||
=== Differences from Model 3 === | === Differences from Model 3 === | ||
The N 3 and the earlier Model 3 share many similarities between scales with a few notable changes for the N series version. Primarily, the Model 3 lacks the "speed rule" back-to-back scales that are ubiquitous on the N series rules. Instead, the reciprocal log log scales are grouped together on one half of the body, while the main LL scales lie on the other half. Additionally, the base for the LL scales of the model 3 is base 10 (the common log) as opposed to base e (the natural log), which gives a different range of possible values on the scale. Finally, because of this different base, the folded scales on the LL side of the model 3 are folded at approximately 2.3, which allows for quick conversion between natural logs and common logs. The model 3 has fewer scales on the slide, and instead makes room on the back for tables which help the user place the decimal point appropriately, which must be done mentally on slide rules and can be quite challenging for those not familiar with slide rule use. | The N 3 and the earlier Model 3 share many similarities between scales with a few notable changes for the N series version. Primarily, the Model 3 lacks the "speed rule" back-to-back scales that are ubiquitous on the N series rules. Instead, the reciprocal log log scales are grouped together on one half of the body, while the main LL scales lie on the other half. Additionally, the base for the LL scales of the model 3 is base 10 (the common log) as opposed to base e (the natural log), which gives a different range of possible values on the scale. Finally, because of this different base, the folded scales on the LL side of the model 3 are folded at approximately 2.3, which allows for quick conversion between natural logs and common logs. The model 3 has fewer scales on the slide, and instead makes room on the back for tables which help the user place the decimal point appropriately, which must be done mentally on slide rules and can be quite challenging for those not familiar with slide rule use. | ||