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m PREFACE. The contents of this V o l u m e and the previous Volume (V) complete, so far as this Series of Dictionaries is concerned, the technicalities dealing With R a i l w a y Construction etc. I n the matter of detailed treatment of expressions dealing with R a i l w a y Rolling Stock a short Chapter w i l l be found entitled " R a i l w a y Workshops**, in which the important expressions relating to special machines, s p e c i a l methods a n d working are dealt with. Owing to the fact that this volume is essentially one dealing w i t h the technical details of R a i l w a y work, it does not embrace the treatment of Machine Tools generally, but that subject is thoroughly dealt w i t h i n all its branches i n the volume on Machine Tools, w h i c h is shortly to be published. order to prevent volume to its proper F o r the same reason, i n and details to confine concerning each the overlapping, scope, production a n d utilization of steam, w h i c h essentially appertain to Steam Boilers a n d E n g i n e Construction, have not of general been included; parts. the same applies to the dealt III, same testing of m a t e r i a l s , and to the detailed machine with in V o l u m e I, E l e m e n t s of Machinery for Working Metal and W o o d , and in Steam B o i l e r s , E n g i n e s a n d T u r b i n e s . description a n d Tools T h e s e subjects are Volume O n the