BOXWOOD AND IVORY RULES. We show and price here a selection from our stock of rules. Some of these are peculiarly useful, and are not generally found on sale. Among them are the Slide Rules, Architects' Two feet Caliper, and the German Flexible Rules, Ivory Rules are desirable for gifts, and where the eyesight is poor, as the black markings on white are more easily read. We do not consider them as reliable as the Boxwood, as they are more apt to shrink. Have seen a first-class Ivory Rule that had shrunken nearly one-eighth of an inch in two feet. However, this class of rule is not often used for close work,. and even as extreme a variation as the above ( which is of course very uncommon ), might not be so serious.
Brass bound on outside edger
No. 60, ARCH JOINT ARCHITECTS' RULE.
SQUARE JOINT "
No. 45. GAUGING ROD.
No. 37. WANTAGE ROD.
No. 32. CALIPER RULE.
No 40. CALIPER RULE.
No. 142. SLIDE RULE.
FABER'S SLIDE RULE.
German Silver bound. We would especially recommend the No. 4 to those who are in the habit of using a rule of this form. It weighs less than one-half as much as the ordinary style, but on account of its construction, ( the plates being on outside of wood) is very much stronger.
CALIPER RULES. This rule we have made especially for us, and we sell great nurnbers of thorn. Will caliper stock up to two inches in diameter.
ARCHITECTS' RULES. This is a style of rule that has been used for a great many years in England. and has only come into general use in this country the past few years. It is exceedingly useful for architects, builders,and all those who handle drawings that are laid out in fractional scale. The rule when closed is in appearance the same as an ordinary folding pocket rule, and can be used as such. The draughting scales are on inner edge of inside.