Chronometry

Chronometry

The science of the measurement of time.

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Chronometry > Clock

pintongs, or pinvice, or pinchuck

Chronometry; Clock

Pintongs are used to hold wire, drills, broaches and for other purposes. Sliding and screw-nose pintongs or pinvices have a small loose or fixed split chuck at the end of a hollow ...

pin-pallet escapement

Chronometry; Clock

In this escapement the pallets are made from small-diameter pins which engage the club-shaped teeth of the escape wheel, all the lift and draw being formed in the escape-wheel ...

pinned plates

Chronometry; Clock

Taper wedging pins have been used from the earliest times to secure mechanical assemblies. In the usual pillar and plate assembly the pillars are riveted to the backplate and are ...

pinion-milling machine

Chronometry; Clock

Pinions for watches and sometimes also for small clocks were usually made from pinion wire, but for larger clocks pinions were milled from a cylinder of steel left standing when ...

pinion-facing tool

Chronometry; Clock

A tool for finishing and polishing the end face of a pinion. A facing tool is made of soft steel or bell metal and used with coarse red stuff for squaring up the pinion face. For ...

pinion wire

Chronometry; Clock

The basic material from which steel or brass pinions are made for small clocks, brass pinions sometimes being used in clock motion work. The pinion wire is produced by drawing ...

pinion polishing

Chronometry; Clock

The flutes and leaves of a pinion are polished in a pinion polishing tool; it consists of a frame in which the pinion is mounted between centers and free to rotate. The frame is ...