and further explained by diagram and ILLUSTRATED IN FIFTY-EIGHT
COLOURS.

_Price 2/6 in strong Paper Cover, 4/6 in Gilt Cloth; postage 3d.
extra._

* * * * *

POCKET MAGNIFYING GLASSES.

After examining some scores of different sorts, we have been able to
get one combining the greatest power with the largest field obtainable
for pocket use. These glasses are mounted in handsome vulcanite
frames, and are very compact. There are two lenses in each, which may
be used singly, or if a very strong power is desired, may be combined.

_Price 7/6; post-free, 7/7; abroad, 8/4._

* * * * *

SURCHARGE MEASURER.

[Illustration:]

The accompanying illustration will give the best idea of what this is.
It consists of a pair of needle-pointed spring compasses, capable, by
means of an adjusting screw, of measuring with the greatest accuracy
all surcharges up to 40 millimètres in length. In addition to the
measure a millimètre gauge is obtained by running the head of the
screw along a piece of paper, a series of lines exactly a millimètre