FIG. 1 is a front perspective view of a first embodiment of a spirometer, showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a front perspective view of a second embodiment of a spirometer, showing my new design;
FIG. 9 is a rear perspective view thereof;
FIG. 10 is a front elevation view thereof;
FIG. 11 is a rear elevation view thereof;
FIG. 12 is a left side elevation view thereof;
FIG. 13 is a right side elevation view thereof;
FIG. 14 is a bottom plan view thereof;
FIG. 15 is a front perspective view of a third embodiment of a spirometer, showing my new design;
FIG. 16 is a rear perspective view thereof;
FIG. 17 is a front elevation view thereof;
FIG. 18 is a rear elevation view thereof;
FIG. 19 is a left side elevation view thereof;
FIG. 20 is a right side elevation view thereof; and,
FIG. 21 is a bottom plan view thereof.
The broken lines are for the purpose of illustrating portions of the spirometer and form no part of the claimed design.
The wire frame lines shown throughout the views are intended to indicate surface contour.