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diff --git a/Electronic_Instrumentation_and_Measurements/Chapter12_1.ipynb b/Electronic_Instrumentation_and_Measurements/Chapter12_1.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:35a41e7b4dbc1cdc77b9a35c5ee4f207fb6b4dc38c71b3e96011895ab456b780"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter12 - Recorders"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.5.1 - page12-7   "
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# chart speed\n",
+      "#Given data :\n",
+      "f=50.0  # frequency in Hz\n",
+      "period=1/f  # in seconds\n",
+      "t=5  #in mm/cycle\n",
+      "chart_speed=t/period\n",
+      "print \"chart speed = \", chart_speed,\" mm/s\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "chart speed =  250.0  mm/s\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file