Múzeumi műtárgyvédelem 16., 1987 (Központi Múzeumi Igazgatóság)
Iparművészeti tárgyak restaurálásáról - Földessy Péter: Egy, az 1760-as években készült éggömb restaurálása
FÖLDESSY, Péter Restoration of a celestial* globe from the 1760s - Summary The celestial globe, which is in the possession of the Library of the Benedictine Abbey in Pannonhalma, consists of two units: l.-.the sphere depicting the sky whose rotation is ensured by a meridian ring fixed into two axle pins, and the calendar frame attached to it, and 2.: the supporting structure whose parts are as follows: the calendar frame, the compass serving the purposes of orientation and the leg piece. The structural elements of the latter are joined by 4 turned columns. The celestial globe and the calendar frame are decorated by painted copper engravings. Some of the structural elements of the object have dried out in the course of time and the metal parts wore off. The paper was damaged in some places, the sphere was ripped along the southern heminsphere in the length of 15-20 cm and the spherical shell made of papier-maché was torn. The compass and the hands of the clockwork were missing. In the first phase of restoration material tests were carried out in order to identify the techniques and materials applied. Cleaning proved to be the most involved procedure while restoring the celestial globe. First water soluble dirt was removed by wet cleaning in fatty alcohol sulphonate. Then followed the removal of the varnish layer. The solvent mixture to be applied on the area to be treated was determined by the Teas-Toracca solubility triangle diagram based on the solubility parameters of the solvents and was composed of the following ingredients: 1.: 1 part of methanol + 1 part of acetone, 2.: 41 parts of acetone + 41 parts of methanol + 17,5 parts of petrol, 3.: 5 parts of acetone + 15 parts of chloroform + 2 parts of petrol. For the removal of persistent dirt a mixture of 50 parts of ethyl formiate + 50 parts of methylene chloride + 2 parts of formié acid proved to be effective. Owing to the natural aging of cellulose the cleaned paper surfaces were yellow; their bleaching was carried out by a stabilized solution of hydrogen 115
