Research work is being undertaken by the Department of Orthodontics at Addenbrooke's Hospital, Cambridge, which involves studying the growth of children's faces in three dimensions. In evaluating the morphology of soft tissues, the advantages oflered by photogrammetry have been recognised and this paper describes how the technique has been put into practice at the hospital where a stereometric instrument, equally siritable for iise as a camera or as a projection plotter, has been constructed.

Details are given of four jobs which have been carried out on a commercial basis and where the measuring problems involved were simplified by the application of non‐topographic photogrammetry. The subjects described are: (i) the measurement of the altitude of storm cloud tops; (ii) a study of a method of measuring distortions on the fuselages of aircraft; (iii) the determination of the trajectories of parachutists; and (iv) recording the shape of a respirator mould. Résumé On décrit quatre opérations où la photogrammétrie non topographique a été utilisée: détermination de l'altitude des sommets de nuages de tempête; vérification des normes de construction de fuselages d'un avion; détermination des trajectoires de parachutistes; restitution de la forme d'un moule respiratoire. Zusammenfassung Angabe der Details von vier Arbeiten, die auf kommerzieller Basis durchgeführt warden und wo die aufgetretenen Messungsprobleme durch die Anwendung der nicht‐topographischen Photogrammetrie vereinfacht werden konnten. Die beschriebenen Beispiele beziehen sich auf (a) die Höhenbestimmung der Spitzen von Sturmwolken (b) eine Studie über ein Verfahren zur Vermessung der Verzerrungen eines Flugzeugrumpfes (c) die Bestimmung der Flugbahn von Fallschirmspringern (d) die Registrierung der Form eines Gasmaskenmodells.

Experimental photography at scales up to 1 : 500 has been taken and analysed, subsequently, using Zeiss C8 and Wild A8 instruments. Results indicate that a 25 mm contour interval may be achieved on reliable surfaces, such as roads and aerodrome runways.

Edinburgh Castle is an ancient monument situated on a basalt crag which has steep cliffs falling away on three of its sides. Periodically, remedial measures have to be carried out on these cliffs by engineering geologists in order to stabilise loosened parts of the surface and thus prevent rock falls occurring. The rock structure on the sheer north‐facing cliff is currently being studied to determine the extent of work required to ensure its stability. Before such a study could proceed satisfactorily it was necessary to obtain a large scale, contoured survey of the face and this has been achieved by terrestrial photogrammetric methods. Stereoscopic photography was taken with a Wild RC5A wide angle camera pointing horizontally, being specially mounted on its side in the elevated bucket of a Simon hydraulic platform, positioned 17 metres above ground level at a distance of 100 metres from the rock face and at eight successive locations in West Princes Street Gardens. The elevation was plotted with a Zeiss Stereoplanigraph C8 at a scale of 1 : 50 with contours (with respect to a vertical datum) at horizontal intervals of 250 mm.

The practical photogrammetric test of thin base aerial film, described in the previous issue of this journal, was repeated with a new set of diapositives, made after the film had been stored in normal conditions for a period of one year. This paper gives the results obtained from both tests which indicate that no significant distortions occurred in the base film. Résumé On a réitéré l'essai pratique de photogrammétrie sur du film aérien à support mince décrit dans le numéro précédent de ce bulletin, avec un nouveau jeu de diapositives obtenu aprés que le film ait été conservé dans des conditions normales pendant une période de un an. Cet article fournit les résultats tirés de ces deux essais qui montrent qu aucune déformation significative n‘est apparue dans le film à support mince. Zusammenfassung Die in der vorhergehenden Ausgabe des Record beschriebenen Tests einer dünnen Filmbasis wurden mil einem neuen Satz von Diapositiven wiederholt. Diese wurden hergestellt, nachdem der Film unter normalen Bedingungen ein Jahr aufbewahrt wurde. Es werden die Ergebnisse beider Untersuchungen mitgeteilt, wobei sich ergab, dass keine signifikanten Deformationen in der Dünnschicht auftraten.