A Manual Of Photography

102 GRIFFIN'S SCIENTIFIC CIRCULAR. [March^ MISCELLANEOUS PHOTOGRAPHIC APPARATUS. Improved Mercury Box (fig. 2686 ^), of walnut, with sliding legs, iron cistern, glass windows for inspecting the development of the picture, mounted with thermometer for ascertaining the temperature of the mercury, 3 sizes. 2707. With three frames for plates up to 44 inches by 3|inches, 18s. 2708. With three frames for plates, up to 6^ inches by 4Z inches, 1Z. 4s. 2709. With three frames for plates, up to 8| inches by 6g inches, 1Z. 12s. 6«. 2710. Mercury Bottle, of box-wood, for holding the mercury necessary for use with the mercury box, 2s. each. 2711. Daguerreotype Spirit Lamp, with screw cap, japanned tin, for heating the mercury box, 2s. 2712. Thermometer for the mercury box, 5s. Improved Iodine and Bromine Box, in pairs (j^.2686 c c), of walnut, enclosing each a stout porcelain pan : each pan is furnished with an air-tight glass cover. On the upper edge of each box is a groove for holding the plate. On withdrawing the glass cover of the iodine pan, the plate is exposed to its action, and the colour produced is observed by holding a sheet of white paper in such a position that its reflection may be seen on the plate, which enables the operator to judge of the progress of tire operation. When the plate has obtained the required colour, the glass cover is pushed in, so as to cover the iodine pan, and the cover over the bromine pan is withdrawn. 3 he plate is now le- moved from the iodine box and placed over the bromine box, and the colour observed as before. When the plate has received the proper amount of bromine, which is perceptible by the colour, the cover of the bromine pan is pushed in, and the plate is again placed over the iodine pan for a few seconds, until the ultimate colour required is pro- duced, and it is then ready for removal to the camera, 3 sizes :— 2713. For plates up to 4^ inches by 3| inches, 1Z. 5s. per pair. 2714. For plates up to 6g inches by 45 inches, 1Z. 16s. per pair. 2715. For plates up to 8^ inches by 6( inches, 2Z. 16s. per pair. Square Porcelain Pans, with air-tight glass cover, for either bromine or iodine mixtures ; the body and glaze firm and compact, and not liable to be acted on by any photographic compound, 3 sizes:— 2716. For plates up to 4^ inches by 3^ inches, with three plate-frames for holding the plates, 6s. 2717. For plates up to 6| inches by 4| inches, with three plate-frames for holding the plates, 7s. 6d. 2718. For plates up to 8| inches by 6| inches, with three plate-frames for holding the plates, 10s. 6d. 2719. Graduated Glass Pipette, for dosing the bromine, 3s. 6^. Walnut Boxes, fitted with grooves for holding 12 plates,/F. 2686/. 2720. For holding the No. 2778 plates, 2s. 6rZ. each. 2721. For holding the No. 2779 plates, 2s. 6d. each. 2722. For holding the No. 2780 plates, 3s. each. 2723. For holding the No. 2781 plates, 4s. each. 2724. For holding the No. 2782 plates, 5s. 6cZ. each.