3 Words to use with device

No other man had made a like voyage; he had little experience to guide him, and he lacked the confidence that a well-tried device assures; he was alone in a tiny vessel with but half an hour's supply of air, a great box of gunpowder over him, and a hostile fleet all around.

Equally the argument applies to the most recent device suggestedthe city manager plan.

The spear of Sir Tristram was emplanted by the point of the truncheon in the ground outside the pavilion, and thereunto his shield was hung so that those who passed that way might clearly behold what was the device thereon.

3 Words to use with  device