Electrical Symbol
By M.C. Childs
At the head of the cellar stairs
there is indicated an electric switch,
and a dotted line points down the stairs˰
In the cellar plan a 50-watt lamp is shown˰
this instrument is used˰
for transferring distances˰
An imaginary cut is
made through materials˰
outside of the border lines˰
Run the line straight through
regardless˰
erasures can be made
Copyright © by the owner.