No other notices of public sales appeared in the _Journal_ for the next several months. The last notice of this period was another announcement of a sale, which was published in the issue of May 30, 1786: _Publick Vendue_, _At_ WARREN's Auction Room, in PLYMOUTH: at Ten o'clock this morning. WILL be Sold, a quantity of bar lead, boxes of glass, 6 x 8. English Shovels and Tongs, bridle-Bits, and a variety of other articles of Hard-Ware. Also, a few Anvils at private sale. Only one instrument signed by Warren is known to survive; it is a wooden surveying compass (fig. 61) in the Streeter Collection of Weights and Measures at Yale University. The instrument, which appears to have been made from walnut, has a compass card with the following inscription around the central medallion: "Made and sold by BENJAMIN WARREN Plymouth New Eng^d." [Illustration: Figure 61.--Wooden surveying compass made by Benjamin Warren (c. 1740-c. 1800) of Plymouth, Massachusetts, and detail of the compass card. The compass, made of cherry wood, is 12 in. long and has a diameter of 6 in. In Streeter Collection of Weights and Measures, Yale University.] [Illustration: Figure 62.--Detail of card, Warren surveying compass shown in figure 61.] The medallion (fig. 62) encloses a harbor scene with a brigantine of the 1740 period off a promontory on which is prominently situated a lighthouse with a smaller building partly visible at the left. The lighthouse is unusual in construction in that it features twin towers rising from a large rectangular wooden building. As far as can be determined from available records, the only lighthouse in America of this period having such construction was the noted Gurnet Light, which was built at the tip of Duxbury Beach in Plymouth Bay in 1768. D. Alan Stevenson[116] relates that the Governor's Council of Massachusetts, when it decided in 1768 to erect the Gurnet Lighthouse at Plymouth, adopted a novel plan to distinguish it from other American lighthouses. "This consisted of double lights set horizontally in the same structure. A timber house built at a cost of L660, 30' long and 20' high, had a lanthorn at each end to contain two four-wick lamps. "In 1802 fire destroyed the house but the merchants of the town promptly subscribed to replace it by temporary lights, as the Government had no immediate funds at its disposal. An Act of Congress of 1802 allotted $2500 for building another set of twin lights and reimbursing the merchants for their expenditure.