A small insulated Leyden jar, placed between an electrical machine and a larger jar or battery, so as to announce, by its repeated discharges, the amount of electricity passed into the larger jar.

An arch of the thickness of one brick.

(UK) One of the shorter rafters used in constructing a hip or valley roof.

(nautical) A block fixed in the topgallant or royal rigging, used for raising and lowering light masts and spars.

In a hip roof, a minor truss used where the roof does not have its full section.

copper sulphate

(surveying) A single straight rod or staff, pointed and iron-shod at the bottom, for penetrating the ground, and having a socket joint at the top, used, instead of a tripod, for supporting a compass.

A short jacket reaching the hips, once part of military uniforms. / The jacket of a shell suit.

plural of jack-a-napes

plural of jack-a-lantern