Daily American organ. [volume] (Washington, D.C.) 1854-1856, 1854-12-29

stantial and solid manner, so that they cannot
be shaken and are OF different heights, 80 as 10
accommodate the small as well as tall boys. On
the inside Of the lowest circle ID the object Ia
ble,p on which is placed the object to be copied.
These rooms, like all tho other recitation rooms,
will not accommodate more than fifty scholars.
There are no seats for them, but all must stand
during the hour of their work. The wall Is pre-
pared and painted black to some height AZ is all
other rooms for recitation, so that with prepared
chalk It makes much better black board than
wood, and nearly as good as slate. In the draw
ing room, this is used by the teacher altogether.
AS specimens Of what the pupils could do, he
pointed to the maps, diagrams, aud pictures Of the
different parts OF the building, which were exceed
ngly well done, and said they were the very hasty
work OF his scholars, got up for this lecture.
The Observatory next claims notice. To those
OF our readers who have seen the building. but
have not examined it fully, II will seem inadequate
to precise transit observations, it seems merely
part Of the main building. But the fact Is, il is
enclosed by the walls Of the Building but does not
touch it. the wall being four inches from It on every
side. The top Is elevated above the main roof, and
is surmounted by dome. The Equatorial is hore
on a marble slab placed on the grders connecting
the walls, and part Of the dome Is 80 arranged as
to be slid back and give the observer a view Of
the Heavens, from horizon to horizon, and the
chair is SO arranged that the operator can by turn
ing crank near him, move HIMSELF the instru-
ment and all, 80 as to have any view he may wish.
Attached to this is the calculating room, where
small library OF astronomical and mathematical
works, table. Nc, are kept for the purpose in
dcated by the name.
Heating and ventilation now received the atten-
tion of the Professor. He dwelt upon the many
experiments with stoves and their failure to keep
up an even temperature; and experiments with
hot air furnaces. Here he showed the connection
between heating and ventilation, and that IL n room
was not properly ventilated, it could not bc heated
by hot air That air would not ascend any quicker
than would water, without some mechanical agen-
cy Air must be Displaced to give room for the
hot air, otherwise the furnace might be heated to
fusion, and very little hot air would ascend to
rooms above. There should be ventilators on the
opposite side to the register If not, the hot air
would make but small circuit and ascend the
fue Here he described the method used by him.
There were fues in each room opposite the regis
ters. These yenta-ducts were open both at the
top and bottom and ran up to the roof without in
terruption, on being joined by another, each room
having its own Under the slope Of the roof is
small room called the ventilating room, where
these fues discharge the foul air brought up.
The sides of this room are lined with tin, and
the floor paved with brick, so that 1t is fire.
proof, and here they keep coal stove con-
stanty burning as to rarity this foul air that 1t
lIuy uUTG TcuuHy Iioc uiiu tHt WdImcF Wcu-
ther the hotter fire they keep. Thus, In the warm
season they establish draft, causing the foul air
to rise by ratification and its place to be supplied
by the pure air through the windows and doors.
On the top of the pipe which carries of the foul
air, Is one Of Emersons patent ventilating caps"
which protects it from the effects Of the winds.
Then he stated that vcnta-ducts should be made
of soft pine wood, as It Is easily warmed and
viii assist in rarfcation-that they should be close
onted, and as smooth possible that they may not
avoid any escape for, friction to the ascending
current.
He concluded by saying that the building CON-
mittee had used all the light they could find on
the subject of school-house architecture, and tho
result of their researches was now before the world
In this building.
In answer to interrogations of Bishop Potter,
and Rev. Dr. Proudfoot, be stated that they used
"Chiltons Furnace" DR.. Lambert inquired its
general effect upon the health Of the scholars
Prof Hart had remarked no change In the pupils,
but had noticed great change in the health Of ono
Of the professors, who, in the old building, was
every winter laid up with a cough several weeks;
but in this, whether from the ventilation or heat
ing, he did not know, but probably both. he had
entirely recovered.
A motion that tho thanks Of the Association be
given to Prof Hart, agreed to, and the Associ-
ton adjourned to Thursday, 10 a m