# Tim Warriner

Welcome to my website. Here are some of the things I have written over the years:

## A book about waves

A free PDF book that explains the basics of mathematical waves and signals in an easy-to-understand way: here

## Storing data and messages in playing cards

How to store and encrypt binary data and messages into a deck of 52 playing cards (or into any group of items that has a predefined order): here

## An explanation of binary and hexadecimal

A free PDF lesson that explains the basics of binary, hexadecimal, and how computers store numbers: here

## A free beginner's guide to the Janome 1200d

A free PDF book that explains how to use the Janome 1200d overlocker (serger) and coverstitcher: here

## A way of remembering playing cards

How to remember which cards have been dealt from a pack of cards by using binary and hexadecimal: here

## Dismantling a Chubb Manifoil combination lock

Some pictures showing the disassembly and reassembly of a second-hand Chubb Mark 4 Manifoil lock: here

## Removing the mysteries of e

An explanation of why Imaginary powers of e behave the way they do: here

## How to calculate the highest common divisor

A method of calculating the highest common divisor (greatest common factor) of two numbers: here

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