Rate Finder & Cancellator
A large circular slide rule for computing insurance premium elapsed days, pro-rata percentages, rate changes, etc. for one year and three year policies. The reverse contains tables for determining percentage of time elapsed for term policies and policies on farm property. Marked "The Discomputer Co., Grand Rapids, Mich., Copyright Feb 18, 1924. The Direct Reading Rate Finder & Cancellator." Detailed directions are printed on front and back. The cardboard rule is 10 3/4" in diameter, with worn outer edge and an ink spot on the pointer arm.
Price: $45 ppd in U.S.
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