Pickett N1006-ES Trig & 1011-ES Trig-Exponential

The Model-1011-ES Trig Exponential was produced in the United States since 1959 until probably 1962. I have not found evidence in the WEB of 1011 models made after 1962. Made all aluminum, coated with white or yellow paint, all plastic cursor screwed to plastic ends, and photo printed scales, this 12 inches rule is practically identical to the N-1010 model, except that the 1011 has an additional Ln scale on the back face.

Designed to fit the needs of students, professionals, and basic Science and Engineering applications, its 18 scales are: K, A [ B, ST, T-Cot, S-Cos, C ] D, DI on the front face, and Ln, DF [ CF, CIF, CI, C ] D, DI, L on the back face.

The Model 1006-ES Trig is identical to the 1011-ES but in pocket size: 6 inches. It was produced in the United States from 1959 until 1964. All aluminum made, it has the same physical characteristics of the 1011-ES. It can be considered as the new version of the 1006 Duplex Trig, a pocket rule identical to the N-1010.

According with the type of logos on these specimens, I conclude that the 1011-ES rule was produced between 1959-1962, while the 1006-ES rule between 1962-1964.

Note: Click on the next links to see professional panoramic pictures of the 1011 and N-1006 models.

1011-ES Trig-Exponential

https://www.sliderulemuseum.com/Pickett/S331_Pickett_1011-ES_Trig-Exponential.jpg

N1006-T Duplex-Trig (Not the same model but same scales as N1600-ES)

https://www.sliderulemuseum.com/Pickett/P091_Pickett_Model_N1006-T.jpg