A 10 inch white faced slide rule with A, B, C, D, CI and K scales.  Also
the Sine, Tangent and Logarithm scales.  Has a large magnifying indicator and is supplied in a black leatherette case.
                                                              MODEL 100....$1.00 EACH

A 10 inch white faced  slide rule  in brown leatherette case.  Has a flat
"Lucite" indicator.  In addition to the A, B, C, D, CI and K scales it has a metric and English linear scale.
                                                               MODEL 50 ......50c EACH

A 10 inch white faced slide rule with unbreakable "Lucite" indicator.  Has A, B, C, D, CI and K scales.  In cardboard case.
                                                               MODEL 10-J...25c EACH

Same as above with Lucite Magnifying indicator

                                                                MODEL 10-D..35c EACH

Made of well seasoned, non-warping wood.  Metal frame indicator with hair line on celluloid.  A, B, C, D, and K scales.  This rule is sufficiently accurate for most high school science and mathematics classes.

                                                                  8-inch Practice ....15c each

For the benefit of the science teacher, the rules are supplied with a table of atomic and molecular weights and other Physical formula for use in Chemistry, Physics and Engineering. This table is available only on rules supplied by us.  If this table is desired, it should be specified in the order.