Direct Calculator by Author Stated (1 results)

Hardcover. Condition: Very Good. Fifth Edition. Circa 1938. "Containing over 1,000,000 distinct calculations, for expediting and ensuring accuracy in multiplication, division, average, percentage, interest, exchange, general calculation by all combinations and numbers in more than 1,000 tables of multiples showing all products from 1 to 1,000 in each table. Arranged for instant and 'direct' reference by marginal indices, etc." - From Title page. An intriguing and impressive artifact from the era before handheld electronic calculators. Clean and unmarked with light wear overall. Upper fore-edges of both boards open. Bright gilt lettering upon spine and front board, which is slightly warped. All 99 index taps present and in excellent condition. A high quality copy.…