. Bulletin. Agriculture -- New Hampshire. 12 UNIV. OF N. H. AGR. EXPERIMENT STATION [Bulletin 240 when in the respiration chamber as nearly as possible the same as those which prevail in the metabolism stalls. No change has, however, been made affecting the principle of ventilation or its theory. The chamber was originally designed for the purpose of carrying out experiments of two to four hours' duration, without regard to measurement of the visible excreta; but with the above changes an experiment may now be extended to any desirable length of time. The respiration chamber consists of a rugg
. Bulletin. Agriculture -- New Hampshire. 12 UNIV. OF N. H. AGR. EXPERIMENT STATION [Bulletin 240 when in the respiration chamber as nearly as possible the same as those which prevail in the metabolism stalls. No change has, however, been made affecting the principle of ventilation or its theory. The chamber was originally designed for the purpose of carrying out experiments of two to four hours' duration, without regard to measurement of the visible excreta; but with the above changes an experiment may now be extended to any desirable length of time. The respiration chamber consists of a rugged framework of 4" x 4" spruce enclosed by a sheet metal shell open at the rear end for entry of the animal, this opening being closed by a double set of doors when the chamber is in use. The details of this frame and door construction have been described in Bulletin 16 of this Station. A four-inch space provided between the double set of doors serves as a reservoir for fresh out- door air supplied by a blower outside of the building. The inside door is pressed against a felt surface which is somewhat porous; hence when air is removed from the chamber to supply the absorbing ap- paratus there will be a proportional seep- age into the chamber from this fresh air reservoir, as the contact between door and felt is the only part of the chamber that is not absolutely sealed. A framework of metal steam pipes (Plate 1), allows free circulation of the air in the chamber. A steel swivel stan- chion gives the animal a reasonable amount of freedom of movement, and eliminates any irksome restraint that causes nervousness. The floor is heavily padded and thus restful in the standing position and favors longer lying periods. Feed box and water are conveniently placed so that during experiments of from one to five days' duration, as now con- ducted, the conditions of existence in the chamber are comparal)le to those main- tained in a modern dairy barn, except for periodical exercise
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