The daily union. [volume] (Washington [D.C.]) 1845-1857, 1851-05-31

JOSIAH HoLBRoek,
Two equateral niangles combined form q rhombus,
nmmony called diamond II is quadrlateral figure,
nth all the sides and the opposite angles equal Another
suiatera triangle added to the rhombus forms trape.
Od; also, four-sided figure, with two of its opposite
ses PARALLEL but not the other two The fourth TRAM
added to the uapexoid On one side forms rhombod.
ioar-sided figure. with lie opposite side and angles
ual, but not all the sides angles II the triangle is
ded to another side of the trapezod, the result is
mother equaieral triangle Four equilateral tranges
shen combined into rhomboid another triangle, can
folded into tetraedron, the most simple OF the five
sular Solids" enclosed, OF course in four equlaleal
ankles The tetraedron, though the most simple, and
because the most simple of oil figures with length,
'adh and thickness, has properties exceedingly inter-
eating and curious. When made OF pasteboard. in con-
SIDERABLE numbers, il be combined into forms literal
numberless and nameless, illustrating the works OF
Nature and OF Art
Six equilaera irisngles, combined around one point as
CENTRE form regular hexagon-a plane, fat surface
with SIX equal sides and angles. This figure has very
secular properties, exhibited in thousands Of forms
h mechanism OF creation, il is in works OF art As
70 rianges combined form the hombus. three OF the
sller figure, like six Of the former, make hexagon
lhs triangular hexagon formed Of riangles and the
ombic hexagon, formed Of rhombuses together are
pabe OF combinations uniting economy, strength, and
>"v suWCtent IOI tne employment On WnOie
coming interesting rich. and beautiful at every step
y progress in the work. The simplicity of such comb
Nations fits them admirably for young hands, in which they
work with assduiy which tires, because pro-
docng forms constantly and increasingly beautiful
light equatera rangles, combined in several differ.
'nt forms, be folded into ociasdron one OF the five
uar solids This is the primary crystal OF very many
Cyshhne forms as exhibited in Nature, and as formed
|V An The alum crystal is regular oc,aedron, a. may
r SHOWN oy drsolvng half pound OF alum in pint Of
|sa'er heated TILL The whole is dissolved, and then suf.
ed to stand perfectly still, with some form OF wire or
''her material immersed till the water cooIs when the
'caedra crystals Of alum will appear in regular forms
and IN great numbers The tetraedron Just describe
combined with the octaedron here mentioned. may pro-
'uce new and greatly varied FORMS illustrating mechan-
sn both Of divine and human origin Of iimitabIe ex-
Rnson, and ndescrbaby beautiful Twenty eqnilateral
|uanges folded may form cossedron enc OF the FIVE
sular solids
ExrrRMENr.--The few short articles on "AaRIcuL-
vRAL GroLooy" recently given to the public, by being
sdely copied in public Journals, both in this and other
Countries. have been made very extensively reading les
on, IN schools. II the same should be done with
MECHANISM" in progress. and various other sub
Nh Of practical science, newspapers would become
shoo books" and schools be constantly envened and
anched by something new. instructive, and entertain
and thus relieved from their present dull monotony,
inch eompels thousands Of the most talented scholars to
sfome The most incorrgibls ruan,s the first step to
HOUSES or REFUGE" and other prisons ~