This is surely preferable to the conjecture of the 6-inch Ordnance (Hampshire, XLI.
All I knew was that, on being called in to give a message over the telephone, I saw lying on the table between them several English six-inch ordnance maps.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "inch ordnance" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.