no
pigment without a guarantee from the manufacturer that it does not
contain this tempting but very dangerous and unstable ingredient. (See
p. 112).

_Form_, the sheet of "continuous cartridge" or cartoon paper on which
the dimensions, &c., are marked out for drawing the cartoon.

_Gauge_, (1) the shaped piece of paper by which the diamond is guided in
cutting; (2) the standard of size and shape in any piece of repeated
work (as quarry-glazing).

_Grisaille_ (from Fr. _gris_, grey), work where a pattern, generally
geometrical, in narrow coloured bands, is superimposed on a background
of whitish, grey, or greenish glass diapered with painted work in
outline or slight shading.

_Groseing_, the biting away the edge of the glass with pliers to make it
fit. With regard to this word and to the term "calm," I have never found
any one who could give a reason for the name or an authority as to its
spelling, the various spellings suggested for the _latter_ word
including Karm, Calm, Carm, Kaim, and even Qualm! But while writing this
book I in lucky hour consulted the treatise of Theophilus, and was
delighted to find both words. The term he applies to the leads is
"Calamus" (a reed), while his term for what we should call pliers is
"Grosarium ferrum" (groseing iron). So that this question is set at rest
for ever. Glaziers must henceforth accept the classic spellings "Calm"
and "Groseing," and one may suppose they will be proud to learn that
these everyday terms of their craft have been in use for 900 years, and
are older than Westminster Abbey.

_Lath_, the ruler, 3 to 8 feet long, and marked with inches, &c., used
in setting out the "forms."

_Lathykin_, doubtless old English "a little lath," described p. 137.

_Lasting-nails_, described p. 141.

_Leaf_ (of lead), the two uprights of the "H" section (fig. 34).

_Muller_, a piece of granite or glass, flat at the base, for grinding
pigment, &c.

_Obtuse_, an angle having a wider opening than a right-angle or
"perpendicular."

_Orphreys_ (_aurifrigia_, from Lat. _aurum_, gold), the bands of
ornament on ecclesiastical vestments.

_Patina_, the film produced on various substances by chemical action
(oxidation, sulphurisation, &c.), either artificially, as in bronze
sculpture, or by age, as in glass.

_Plating_, the doubling of one glass with another in the same lead.

_Quarries_, the diamond, square, or other shaped panes used in
plain-glazing.

_Reamy_, wavy or