are constantly growing in popularity, and they can now be obtained from
the leading houses in our line throughout the United Kingdom.
[Illustration: [Slide Rule]]
We manufacture a complete line of ENGINE-DIVIDED SLIDE RULES, and call
special attention to our Patent Adjustment, ensuring smooth working of
the Slide; also to our new “Frameless” Indicator, which hides no figures
on the Rule.
[Illustration: [Thacher’s Calculating Instrument]]
THACHER’S CALCULATING INSTRUMENT, for solving problems in
multiplication, division, or combinations of the two; has upwards of
33,000 divisions. Results can be obtained to the fourth and usually to
the fifth place of figures with a surprising degree of accuracy.