Thanks FourBee.
Seeing the powder ladle begs the question, were the shafts marked in some way so the loader could tell top and bottom when it was rotated?
The Gunner's Glass by William Eldred Let your right hand man bring your ladle and your sponge and place them on the right side of your peece between the wheel and the carriage and stand you on the same right side; then let him provide a fit shot for the peece and lay it ready; let your left hand man provide two wads of ocam, hay or straw and wind them as round and tight and place them between the spokes of the wheels that the wind blow them not away, and then let him fetch the budge-barrel with powder, then to lay your peece to pass to load, let your two assistants one on the right side, the other at the left, be ready with their levers - handspikes - to press up the peece to discharge the coyne and stand you with one leg within the carriage and the other without, but not both legs within the carriage, as that is unseemly; the coyne being discharged, draw back so that the peece may lie level or a little higher at the mouth than at the breach, then your peece being put back, which must first be done is ordered to load.
Then comely and gracefully take up your ladle and put it into the Peece, and turn and move it too and fro, to search if there be any stones or gravel in the same, that you may bring it out with your ladle, and so clear the Peece, and when you have well cleared the same from stones and gravel with your ladle, set by your ladle in his place, take your sponge in comely manner like a soldier, and sponge well your peece.
Then let your left man bring the budge-barrel, with the powder, and hold it up as high as his knee or waste, keeping the same, holding one hand under the leather to keep the powder that it scatter not least any be lost, then thrust in your ladle and fill the same at 2 or 3 proffers, your laddle thus filled, let your assistant with his hand strike off the loose powder.
Then with a steady hand put your ladle with the powder into the peece, keeping the thumb of your left hand close to the Peece, put in your Ladle with powder at three motions, and always carry a steady eye upon the ladle staff, as you put it in, that in no wise it may turn aside, till you feel the Ladle stop at the end of the chamber.
Then fix your thumb of your right hand on the upperside of the ladle staff, and empty your ladle clean, by turning your thumb that you fixed on the uppeside, with the ladle staff, till your thumb and staff that was uppermost before, is now undermost and so your ladle shall be clean emptyed, then withdraw your ladle a foot, and shake the same so that no loose powder may remain behind in the ladle, and the ladle thus emptied, bring it gently out, and take heed you shame not your self in bringing some powder out again with the ladle, which is imputed a great shame to a Gunner.