The circular crystal of a temperature indicating instrument has a circular flange rotatable in a channel in the instruments' casing. Fingers on the casing have teeth which mesh with teeth on the flange. The fingers yieldably hold the crystal in place but the crystal can be forcibly rotated. The crystal has a slotted post thereon and on said post is a bimetallic spiral coil the inner end of which is in the post's slot. Another post in the casing covers the slot to keep the coil in place on the former post. On the back of the casing is a supporting bracket adjustable to several positions.
A case for encasing a meter movement and its associated pointer comprised of an assembly at least a portion of which is transparent which completely encases the meter movement and pointer, connecting means for providing input signals to the meter movement through the assembly, a rear cover having openings for receiving the connecting means and proportioned to abut the rear of the assembly with the connecting means disposed within those openings, a scale of generally flat dimensions for displaying the parameter to be measured by the meter movement and indicated by the pointer which scale is held fixedly between the rear cover and the assembly in a position allowing a sweeping of the pointer across the face of the scale to indicate the level of the parameter sensed by the meter movement thereby allowing an exchange of the scale for some second scale without any possibility of physically engaging the pointer or the meter movement and causing damage thereto.
A liquid level indicating gage comprised of two unitary or integral molded components one, or first component, molded of a clear transparent plastic being a sight window, an arc segment and two leg mounts attached to said sight window, and a mounting hole in each leg mount, and screw mounting holes in the face of the sight window, the other or second component being a unitary or integral molding of foamed plastic, this component consisting of a float section attached to a float arm section and an upper arm section and an indicating segment extending from the upper arm section, and pivot pin axle at the juncture of the upper arm section and float arm section, the second component pivot pin axle mounted in the holes in leg mounts of sight glass, the foamed plastic float section of second component having a specific gravity less than the specific gravity of liquid being measured and the float section to activate the indicating segment located on under side of the sight window.
