海事オブジェ - Walker's - 船の航海日誌 Cherub Mark III – ウォーカーズ、バーミンガム、1940年

水面上を一定時間内に進んだ距離を測定する精巧な船舶の航海日誌。水上の距離を時間（時）で割ると、水中を進む速さがノットで得られる。

Mark III in case with two spare windows, two rotators, hook and gimbal foot. Three dials on ennamel face, the larger registers up to 100 miles, the smaller two register up tot ten and 1000 mile. Two four bladed rotators stamped with anchor motif and initials TW.

The production of the Mark III commenced in 1930 and ceased in 1994. Details and serialnumber suggest a manufacturingdate circa 1940.

Date: ca. 1940
L log: 24 cm
Diameter log: 11.7 cm
Log signed: WALKER’S CHERUB, serialnumber AC3586
Origin: England
Condition: good and complete, signs of use