OTHER PUBLICATIONS.
THE WATKINS MANUAL of Photographic Exposure and Development.
9th Edition (about 80,000 sold).
“The only Manual I have read which seems to me absolutely simple and direct.”—Westminster Gazette. (Post 3d.) 1s. 3d.
MUST WE TRADE IN TENTHS, being a plea against Decimal and for Octaval Coinage as more exactly fitting the wants and usage of all who make, grow, buy or sell things.
“A powerful plea.”—Financier and Bullionist. (Post 1d.) 3d.
TWO LEAFLETS FREE FOR POSTAGE.
OCTAVAL NOTATION AND THE MEASUREMENT OF BINARY INCH FRACTIONS.