[Illustration: ALBANY BUILDINGS SOUTHPORT. E.W. JOHNSON, ARCHITECT.]

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THE BLUE PRINT PROCESS.

R.W. JONES.


1. Cover a flat board, the size of the drawing to be copied, with two or
three thicknesses of common blanket or its equivalent.

2. Upon this place the prepared paper, sensitive side uppermost.

3. Press the tracing firmly and smoothly upon this paper, by means of a
plate of clear glass, laid over both and clamped to the board.

4. Expose the whole--in a clear sunlight--from 4 to 6 minutes. In a
winter's sun, from 6 to 10 minutes. In a clear sky, from 20 to 30
minutes.

5. Remove the prepared paper and pour clear water on it for one or two
minutes, saturating it thoroughly, and hang up to dry.

The sensitive paper may be readily prepared, the only requisite quality
in the _paper_ itself being its ability to stand washing.