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diff --git a/electronic_instrumentation_by_H_S_Kalsi/Chap12_1.ipynb b/electronic_instrumentation_by_H_S_Kalsi/Chap12_1.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:7af0495b58ca6c852d68e4365d49889cd4f3d900affcfb795083ae4f78ea1db8"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12 Recorders"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.1 Page no 373"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "t=5                                    #second\n",
+      "s=40.0                                    #cycle\n",
+      "\n",
+      "#Calculation\n",
+      "p=t/s\n",
+      "f=1/p\n",
+      "\n",
+      "#Result\n",
+      "print\"The frequency of the signal is \", f,\"cycle/sec.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The frequency of the signal is  8.0 cycle/sec.\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.2 Page no 373"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Given\n",
+      "f=20.0                                       #Hz\n",
+      "t=5                                         #mm\n",
+      "\n",
+      "#Calculation\n",
+      "p=1/f\n",
+      "s=t/p\n",
+      "\n",
+      "#Result\n",
+      "print\"The chart speed isn\", s,\"mm/s\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The chart speed isn 100.0 mm/s\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file