tie-rods and turn-buckles anchoring the framework to the ceiling, the
I-beam construction at the top upon which is subsequently installed the
large balance for weighing the man, the series of small channels set on
edge upon which the asbestos floor is laid, and the upright row of
channel ribs are all clearly shown.

[Illustration: FIG. 10

Photograph of framework of chair calorimeter. In the photograph are
shown four upright channels and the channels at the top for supporting
the calorimeter. The smaller upright 2-1/2 inch channels and angles are
shown inside of this frame. In the lower part of the figure is seen the
asbestos board for the bottom of the calorimeter and underneath this a
sheet of zinc.]

[Illustration: FIG. 11

Photograph of portion of framework and copper shell. The finished copper
shell is seen in position with some of the thermal junction thimbles
soldered into it. A portion of the food aperture and the four brass
ferrules for conducting the water pipes and air pipes are shown. A
section of the zinc outside is shown in the lower part of the figure.]

A photograph taken subsequently, showing the inner copper lining in
position, is given in fig. 11.

The floor of the chamber is supported by 7 pieces of 2-1/2-inch channel
(N, N, N, fig. 8), laid on top and bolted to the two 3-inch channels (M,
fig. 8). On top of these is placed a sheet of so-called asbestos lumber
(J', fig. 8) 9.5 millimeters thick, cut to fit exactly the bottom of the
chamber. Upright 2-1/2-inch channels (H, fig. 8) are bolted to the two
outside channels on the bottom and to the ends of three of the long
channels between in such a manner as to form the skeleton of the walls.
The upper ends of these channels are fastened together by pieces of
piping (P, P, P, fig. 8) with lock-nuts on either side, thus holding the
whole framework in position.

The I-beams and channels used to tie the four upright channels at the
top form a substantial platform upon which is mounted a large balance
(fig. 9). This platform is anchored to the ceiling at four points by tie
rods and turn-buckles, shown in fig. 4. The whole apparatus, therefore,
is extremely rigid and the balance swings freely.

The top of the chamber is somewhat restricted near the edges (fig. 8)
and two lengths of 2-1/2-inch channel support the sides of the opening
through which the subject enters at the top (fig. 7).

Both the front and back lower channels upon which the bottom