Annual report to the superintendent of schools

Mode of access: Internet.

Biennial report of the Board of Education and the Superintendent of Schools

Report year ends June 30

Report of the principal of schools

Mode of access: Internet.

Parley's Common school history revised: a pictorial history of the world, ancient and modern, for the use of schools.

An abridged edition of "Peter Parley's Universal history on the basis of geography" which was published in 2 v. in 1837, prepared for Goodrich originally by Nathanial Hawthorne with the aid of his sister Elizabeth. cf, Lathrop, G. P., Study of Hawthorne, 1876, p. 171-172; Goodrich, S. G., Recollections, 1856, v. 2, p. 541 (foot-note) 544.

A complete course of volumetric analysis for middle and higher forms of schools,

Mode of access: Internet.

A text-book of vegetable and animal physiology. Designed for the use of schools, seminaries, and colleges in the United States.

Embellished with upwards of four hundred and fifty illustrations.

Annual report of the City Superintendent of Schools for the year ending June 30 ...

Mode of access: Internet.

Field inspection of building construction.

Includes bibliography.

A grammar of the Latin language; for the use of schools and colleges

Mode of access: Internet.

Comparison of schools with high and low proportions of poverty pupils /

Chiefly tables.

A grammar of the English language in a series of letters. Intended for the use of schools and of young persons in general ; but more especially for the use of soldiers, sailors, apprentices, and plough-boys. To which are added six lessons intended to prevent statesmen from using false grammar and from writing in an awkward manner.

Title on spine: Cobbett's grammar.

Musical composers and their works; : for the use of schools and students in music, /

Mode of access: Internet.

Ultrasonic inspection of austenitic stainless steel weldments

Ultrasonic waves interact in a complex manner with the metallurgical structure of austenitic weldments resulting in ambiguity when interpreting reflections and at times in misinterpretation of defect positions. In this work, current knowledge of the structure of austenitic welds is outlined, and the influence of this structure on the propagation of ultrasonic waves is reviewed. Using an established and highly accurate technique, data on velocity variations as a function of the angle between the direction of soundwave propagation and the axes of preferred grain orientation existing in such welds, are experimentally obtained. These results and existing theory are used to provide quantitative evidence of (i) anisotropy factors in austenitic welds, (ii) beam skewing effects for different wave modes and polarizations, and (iii) the extent of acoustic impedance mismatch between parent and weld metals. The existence of "false" indications is demonstrated, and suggestions are made into their nature. The effectiveness of conventional transverse wave techniques for inspecting artificial and real defects existing in austenitic weldments is experimentally investigated, the limitations are demonstrated, and possible solutions are proposed. The possibilities offered by the use of longitudinal angle probes for ultrasonic inspection of real and artificial defects existing in austenitic weldments are experimentally investigated, and parameters such as probe angle, frequency and scanning position are evaluated. Detailed work has been carried out on the interaction of ultrasound with fatigue and corrosion-fatigue cracks in the weld metal and the heat affected zones (HAZs) of 316 and 347 types of austenitic weldments, together with the influence of elastic compressive stresses, defect topography and defect geometry. Practical applications of all results are discussed, and more effective means of ultrasonic inspection of austenitic weldments are suggested.

Inspection of parts with complex geometry and welds with structural health monitoring techniques

Structural Health Monitoring (SHM) systems were developed to evaluate the integrity of a system during operation, and to quickly identify the maintenance problems. They will be used in future aerospace vehicles to improve safety, reduce cost and minimize the maintenance time of a system. Many SHM systems were already developed to evaluate the integrity of plates and used in marine structures. Their implementation in manufacturing processes is still expected. The application of SHM methods for complex geometries and welds are two important challenges in this area of research. This research work started by studying the characteristics of piezoelectric actuators, and a small energy harvester was designed. The output voltages at different frequencies of vibration were acquired to determine the nonlinear characteristics of the piezoelectric stripe actuators. The frequency response was evaluated experimentally. AA battery size energy harvesting devices were developed by using these actuators. When the round and square cross section devices were excited at 50 Hz frequency, they generated 16 V and 25 V respectively. The Surface Response to Excitation (SuRE) and Lamb wave methods were used to estimate the condition of parts with complex geometries. Cutting tools and welded plates were considered. Both approaches used piezoelectric elements that were attached to the surfaces of considered parts. The variation of the magnitude of the frequency response was evaluated when the SuRE method was used. The sum of the square of the differences was calculated. The envelope of the received signal was used for the analysis of wave propagation. Bi-orthogonal wavelet (Binlet) analysis was also used for the evaluation of the data obtained during Lamb wave technique. Both the Lamb wave and SuRE approaches along with the three methods for data analysis worked effectively to detect increasing tool wear. Similarly, they detected defects on the plate, on the weld, and on a separate plate without any sensor as long as it was welded to the test plate.