Comes commercii, or, Merchant and trader's-companion
Subtitle: containing I. an exact and useful table, shewing the value of any quantity of goods or wares ready cast up, more adapted to merchants use, than any other extant
By: calculated by an ingenious accomptant; II. Tables of exchange, in two parts...with the appendix of exchange at par; III. Tables of commission at the several rates mostly used in Ireland; IV. An index to intrest, containing tables of simple interest...to all which is prefixed a table of guineas and half-guineas...together with a table of the number of yards in the several scores of linen, from 1 to 150.
Edition: 8th ed.
Publisher: Printed by James Byrn, No. 2 Sycamore-Alley
Published: 1790
Place of publication: Dublin
Language: eng
Number of pages: 144
Subjects: Ready-reckoners.; Interest -- Tables.; Money -- Ireland -- Tables.
Genres: Tables.
Other titles: Merchant and trader's companion
Notes: "The tables of exchange, commission, and coin calculated originally: all the other tables cast up in manuscript, and the whole work carefully corrected."

Signatures: 12mo: A-M⁶ [$3 (-A1) signed]

Burns Library copy: bookplate: "In memory of Helen Landreth, Curator - Irish Collection 1893-1981."
Table of contents: value: II. Tables of exchange in two parts. 1. English money exchanged into Irish. 2. Irish money exchanged into English. Each by addition only, for any sum of 300 pounds to 1 penny, and at the several rates, whether quarters or eighths, from five per cent. to eleven per cent."