International Correspondence Schools · Scranton, International textbook company · leaf 114
^ unwholesome, and in factvery poisonous, and should never be inhaled. The sign to beetched is laid on a table, the top of which has been rendered … Fig. 4. perfectly level, and over it is suspended a funnel-shaped hood,to collect the fumes and carry them off to the outside air or toa chimney flue. This arrangement is shown in Fig. 4, whereh is the etching table under the hood a. At c is shown thevent that carries off the obnoxious vapors. 63.…
Lettering · Sign painting
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-51-44.webp)
