| Magpies | Interruptions to the telegraph lines. | |
| Mathematical names | Queensland | Alpha, Beta and Delta |
| Marconi | On board ships. | Forms. |
| Development of wireless technology. | ||
| McGeorge, James | South Australia | Constructed the first telegraph line in SA (illegally). |
| McGowan, Samuel | Victoria | Brief biographical summary. |
| Marriage | Queensland | Nurses cannot work after marriage. |
| Measurements | Metric and Imperial as well as currency ($ and £). | |
| Melba, Dame Nellie | Victoria | Cover to P. M. Billy Hughes with T.O. Coldstream date stamp. |
| Messengers | Home page | All aspects including recruitment, age, conditions and uniform. |
| What was not a uniform. | ||
| South Australia | Recollections of a 14 year old Messenger at Tanunda - Mr. H. Schreoder. |
|
| Meterological | ||
| Money Orders | Australia | Overview of the Telegraphic Money Order system. |
| Forms used for receipt. | ||
| New South Wales | Basic concepts and early developments. | |
| South Australia | Todd's 1858 proposals. | |
| Victoria | Examples of Money Order forms used in Interim Period. | |
| New Zealand | ||
| Morse Code | Summary of the use of the code in Australian telegraphy and the actual code. | |
| Multiple telegrams | Australia | |
| Murder | Tasmania | The ancestry of the Southport Telegraph Office. |