The 3-metre gun was used in war during the early Rattanakosin era.

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Museum director Nitaya Kanokmongkol said |that the process of preservation could take months, and visitors will be able to get a close-up look at how it&rsquo;s done. 
&nbsp;The museum will also soon host a lecture on the ancient cannon.

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Visitors to view cannon preservation at National Museum

Culture Minister Vira Rojpojchanarat on Wednesday visited Thailand’s National Museum in Bangkok to observe the preservation process for the ancient cannon unearthed from beneath Sanam Luang last weekend.