This paper reviews the deflection of the vertical and its use and abuse in geodetic surveying. ‘Importantly, the deflection of the vertical in Australia will change by around 6” upon the implementation of the Geocentric Datum of Australia (GDA94). Therefore, for some applications, the deflection of the vertical may no longer simply be neglected in survey computations and adjustments. With the r...

The ECG is one of the oldest and most versatile noninvasive cardiac diagnostic tests. It has remained in use essentially in its original form despite dramatic advances in cardiac electrophysiology. In May 1887, Augustus Desiré Waller recorded the first human Electrogram using a primitive instrument called a Libbmann capillary electrometer. It had 2 deflections corresponding to ventricular depol...

Faraday rotation measurements are used to constrain simple models representing possible extremes of the structure of extra-galactic magnetic fields (EGMFs). Relevant fields are found quite generally to be at the μG level rather than the nG level usually assumed. Even the highest energy cosmic ray protons should experience large deflections over distances of order 1 Mpc. Such large deflections a...

This paper describes a survey of an engineering structure that required high precision results. It is intended as a case study, primarily for surveying students, though the application of the techniques may provide insight to a wider audience. The purpose of the survey was to monitor movements of a new arch bridge to better than ±1 mm. The coordinates of targets placed on the arch structure wer...

This paper describes the use of digital photogrammetry for measurement of deflections in concrete beams during destructive testing. A two-video camera system was used to measure vertical deflections with a precision of ±0.25mm (1σ). The system, network design and processing methods are described in detail. Results are presented from several tests of different types of beams. Some of the advanta...

We consider the problem of the contact between a rigid sphere and a thin initially flat plate. After reviewing some plate theory, we establish that a deformation where a finite piece of the plate takes the shape of the sphere is physically unrealisable, and that the contact region must be a ring. However, for both small deflections using classical linear elastic theory and large deflections usi...