For measuring the hardness of a mineral, several common objects that can be used for scratching are helpful, such as a fingernail, a copper coin, a steel pocketknife, glass plate or window glass, the steel of a needle, and a streak plate.
Certain common objects that have been assigned hardness values roughly corresponding to those of the Mohs scale (e.g., fingernail [2.5], pocketknife blade [5.5], steel file [6.5]) are usually used in conjunction with the minerals on the scale for additional reference.
Swiss Army knife, multibladed pocketknife that evolved from knives issued to Swiss soldiers beginning in 1886.
Effects such as an altimeter, pocketknife, and letters were found but no camera.
Personal effects found on Mallory included his goggles, altimeter, and a pocketknife, but not the camera he is thought to have taken with him when he left for the summit.
Feels like he dug it out of me with a pocketknife".
Bahaa slashed the raft with the pocketknife, then helped pitch the motor into the water.
— Connecticut Senator Joe Lieberman "I'd rather be working with a pocketknife in Haiti than worrying about the danger of a radioactive cloud".
Laguiole knives, with their distinctive bee on the spring, derive from a farmer's pocketknife and originate in the South of France.
He then directed everyone to switch off their phones — the coast guard picked up transmission signals — and gave Bahaa a pocketknife.
And first of all, it was a pocketknife.
