From 262549dd454b3a9f4a2381df9dbb62ab4e474ced Mon Sep 17 00:00:00 2001
From: Jason Aguirre <78043305+jasonaguirre@users.noreply.github.com>
Date: Wed, 26 Apr 2023 01:02:26 -0400
Subject: [PATCH] Update 2023-04-18.md

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 notes/2023-04-18.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/notes/2023-04-18.md b/notes/2023-04-18.md
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@@ -117,6 +117,12 @@ between Springs and dampers, the mechanical things are used to build these mecha
 [timeline of computing](https://www.computerhistory.org/timeline/computers/)
 
 
+### The Complex Number Calculator (CNC) (1940)
+
+The Complex Number Calculator (CNC) was a mechanical device invented by George R. Stibitz in 1940. It used electrical relays to perform complex arithmetic operations on binary-encoded complex numbers, allowing for faster and more accurate calculations than by hand or with analog computers. 
+
+
+The machine had two input registers, one for the real part of a complex number and another for the imaginary part. The output of the calculation was displayed on a series of light bulbs. The CNC was groundbreaking in its ability to perform complex arithmetic in real-time using a mechanical device and paved the way for the development of electronic digital computers. 
 
 ### Model K Adder (1937)