The names given to the various lines of a tooth on a gear-wheel are as follows: In Figure 233, A is the face and B the flank of a tooth, while C is the point, and D the root of the tooth; E is the height or depth, and F the breadth. P P is the ... Read more of Drawing Gear Wheels at How to Draw.caInformational Site Network Informational
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Employed Under The Name Of Liquid Asphaltum








TTITLE BISTRE

is extracted by watery solution from the soot of wood fires, whence it
derives a strong pyroligneous scent. It is a very powerful
citrine-brown, washes well, and has a clearness suited to architectural
subjects. Its use is confined to water-colour painting, in which it was
much employed by the old masters for tinting drawings and shading
sketches, before the general application of Indian ink to such purposes.
Of a wax-like texture, it is perfectly durable, but unfitted for oil,
drying therein with the greatest difficulty.

A substance of this kind collects at the back of fire-places in cottages
where peat is the constant fuel burnt; which, purified by solution and
evaporation, yields a fine bistre, similar to the Scotch. All kinds of
bistre attract moisture from the atmosphere.

TTITLE BONE BROWN





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