In the London Fair he received an honourable mention and presented a set of microfilms to Queen Victoria .
In 1862 , Dagron exhibited his miniature Stanhope viewers during London 's International Fair .
In the London Fair Dagron received an honourable mention and presented a set of microfilms to Queen Victoria .
In 1862 , Dagron exhibited his miniature Stanhope viewers during London 's International Fair .