The pattern maker's assistant : embracing lathe work, branch work, core work, sweep work, and practical gear construction : the preparation and use of tools : together with a large collection of useful and valuable tables (1878)
Rose, Joshua · New York : D. Van Nostrand · leaf 90
89 THE FOUNDRY — CORES. It would be a costly matter to make core boxes for long cylindrical cores, such as are used for pipe and similar cast- ings ; bence, for sucb purposes, a core is made as sbowu in Fig. 84, in which 0 represents a core for a pipe, having a … socket at one end. It is prepared as follows : Upon the two tressels, A A, is mounted the long tube, D D, which is perforated throughout its entire length with numerous small holes, and which is provided at one end with a crank handle, by means of which it may be revolved as it rests in the two…
Patternmaking
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Architectura civilis, das ist, Eigentlich Beschreibung wie Ma[nn] nach bester Form vnd gerechter Regul ... (1628)](https://img.insideoutlibrary.com/img/200/ia-gri_33125009734308-120-0.webp)
