Abstract: Gypsum panels, panel cores, and methods for the manufacture thereof are provided herein. A gypsum panel core includes gypsum and fiberglass, the fiberglass being present in the core in an amount of from about 1 lb/msf to about 6 lb/msf. The core has a thickness of about 1/2 inch, a weight of from about 1400 lb/msf to about 1750 lb/msf, and an ASTM E-119 wood stud fire test rating of at least 30 minutes.

Abstract: Gypsum panels, panel cores, and methods for the manufacture thereof are provided herein. A gypsum panel core includes gypsum and fiberglass, the fiberglass being present in the core in an amount of from about 1 lb/msf to about 6 lb/msf. The core has a thickness of about 1/2 inch, a weight of from about 1400 lb/msf to about 1750 lb/msf, and an ASTM E-119 wood stud fire test rating of at least 30 minutes.

Abstract: Gypsum panels, panel cores, and methods for the manufacture thereof are provided herein. A gypsum panel core includes gypsum and fiberglass, the fiberglass being present in the core in an amount of from about 1 lb/msf to about 6 lb/msf. The core has a thickness of about ½ inch, a weight of from about 1400 lb/msf to about 1750 lb/msf, and an ASTM E-119 wood stud fire test rating of at least 30 minutes.

Abstract: Gypsum panels, panel cores, and methods for the manufacture thereof are provided herein. A gypsum panel core includes gypsum and fiberglass, the fiberglass being present in the core in an amount of from about 1 lb/msf to about 6 lb/msf. The core has a thickness of about ½ inch, a weight of from about 1400 lb/msf to about 1750 lb/msf, and an ASTM E-119 wood stud fire test rating of at least 30 minutes.

Abstract: A daylight enlarger of the enclosed image-framing area type wherein the image framing area is enclosed by solid curtain walls having at least one light-tight arm-hole therein and wherein part of one of the walls encompasses in a light-tight manner a removable actinic light opaque processing dish having a lid which when the dish is present in the wall can be opened to enable print material to be placed therein and which can be closed from inside the enclosed image framing area.

Abstract: A combined masking frame and photographic sheet material container comprises an elongated flat compartment for storing photographic sheet material and which has a side opening for removing sheets therefrom; the container has a top panel which has a rectangular recess therein having a planar light-reflecting surface and being of a shape to accomodate the sheets stored in the compartment. The container has hingedly attached thereto a lid which, in closed position, covers the top panel; the lid has along a front side an angular flange which when the lid is closed covers in a light-tight manner the side opening in the container, there being present in the lid a rectangular aperture of an area slightly smaller than the area of the recess so as to form a mask around the edge of a sheet in position in the recess.

Abstract: A film cassette unloading and film processing device comprises a light-sealable container having means to hold a film cassette in such a manner that a length of film can be withdrawn therefrom, together with a film cutting means. A lid member of a processing tank of the film-holding spiral type, is rotatably but detachably mounted in a light-tight manner in one side of the container, the spiral being attached to the lid member and so located in the container that the film from a cassette can be wound thereon. On the opposite side of the container there is located a tank-completing base member which, together with the lid member and the spiral, forms a processing tank of the film-holding spiral type.

Abstract: For printing transparencies frames are used which, either by means of their framework or of the borders of transparencies mounted thereon, mask areas which are greater than those of the transparencies. A first frame loaded with a first set of mounted transparencies is placed over a sheet of print material and a first exposure is made. The first frame is removed and a second frame loaded with a second set of mounted transparencies is placed over the same sheet of print material in such a position that the transparencies mounted thereon are in alignement with those areas which were masked previously by the first frame. Then a second exposure is made.