A reflective pilot light viewer is disclosed. The reflective pilot light viewer has an attachment flange securable to a water heater tank by fasteners. The reflective pilot light viewer also has a viewing segment joined to the attachment flange and extending from the access outer panel at an approximate forty-five degree to fifty degree angle, the viewing segment having an upper portion which is a reflective surface. An access outer panel having the reflective pilot light viewer and a water heater having the reflective pilot light viewer are also disclosed.

A case for a gas turbine engine includes a case wall and a boss that extends from the case wall. The boss includes a perimeter step.

A viewport for a combustion zone includes an inner casing having a flange extending into the combustion zone. A first layer of ceramic fiber insulation is exterior to the inner casing. A middle casing includes two panes of quartz glass separated by traverse plates. A second layer of ceramic fiber insulation is exterior to the middle casing. An outer casing is positioned to the exterior of the second layer of insulation. The middle casing includes L-shaped ledges having third and fourth layers of ceramic insulation. The panes of glass are each positioned between layers of insulation and the insulation positioned in the L-shaped ledges. The viewport is modular enabling the separation of the first layer of insulation, the middle casing, the second layer of insulation and the outer casing from the combustion zone for maintenance or repair. The viewport minimizes heat migration to the outer casing during use.

A viewport for a combustion zone includes an inner casing having a flange extending into the combustion zone. A first layer of ceramic fiber insulation is exterior to the inner casing. A middle casing includes two panes of quartz glass separated by traverse plates. A second layer of ceramic fiber insulation is exterior to the middle casing. An outer casing is positioned to the exterior of the second layer of insulation. The middle casing includes L-shaped ledges having third and fourth layers of ceramic insulation. The panes of glass are each positioned between layers of insulation and the insulation positioned in the L-shaped ledges. The viewport is modular enabling the separation of the first layer of insulation, the middle casing, the second layer of insulation and the outer casing from the combustion zone for maintenance or repair. The viewport minimizes heat migration to the outer casing during use.

A door assembly for an oven comprises an inner frame, a first glass panel and a first pair of brackets coupled with the inner frame and compressively retaining the first glass panel against the inner frame.

A door assembly for an oven comprises an inner frame, a first glass panel and a first pair of brackets coupled with the inner frame and compressively retaining the first glass panel against the inner frame.

Apparatus for insertion into a cavity of an object, the apparatus comprising: a first tube comprising a first end, a second end and a first cavity extending between the first end and the second; a member positioned within the first cavity of the first tube and configured to enable an action to be performed; a heat pipe including a first end, a second end, and a second cavity extending between the first end and the second end, the first tube being positioned within the second cavity of the heat pipe; and an actuator configured to move the first tube relative to the heat pipe.

A case for a gas turbine engine includes a case wall and a boss that extends from the case wall. The boss includes a perimeter step.

A case for a gas turbine engine includes a case wall and a boss that extends from the case wall. The boss includes a perimeter step.

A tunable diode laser absorption spectroscopy (TDLAS) optical head includes a housing configured for attachment to a sight tube attached to a wall of a process chamber. The TDLAS optical head further includes optics within the housing for transmitting, receiving, or transmitting and receiving a laser beam within a process chamber through the sight tube. The TDLAS optical head further includes a photo sensor in the housing positioned to receive light emitted by combustion within the process chamber to which the housing is attached.