The leaf of the fore-sight has a pinhole, and that of the tangent sight cross-wires for fine reverse laying.
From a pinhole burner, fed through a cavity C, one side of which is closed by a membrane m; on the other side of the membrane is another cavity C', which is put into connexion with a source of sound, as, for instance, a Helmholtz resonator excited by a fork of the same frequency.
Above a pinhole burner and igniting the gas above the gauze.
Very interesting modifications of these phenomena are observed when a jet from an orifice in a thin plate (Tyndall has shown that a pinhole gas burner may also be used with advantage) is directed obliquely upwards.
Of water, issuing from a pinhole steatite burner.