If I recall correctly, the sailor was Joshua Slocum on Spray, and his singlehanded instrument was an alarm(?) clock missing its minute hand. Not much of a chronometer but he couldn’t afford one. I think I have his book around here somewhere but it might take hours to find it, so I’ll have to go with memory. Probably 45 years since I read it.Tom K, on the beach, formerly of the Wylie 33 Constellation
Bingo! Tom K wins the dessert and extra scoop. Great memory, Tom. It was indeed Joshua Slocum who carried a "tin alarm clock with a smashed face and minute hand missing" for navigational purposes..a "singlehanded instrument." Apparently, the clock, which Slocum got at discount for $1.00, had its idiosyncrasies and needed to be boiled in water before use....No calibrated chronometer aboard SPRAY.
Sleuthing recently tracked down a replica of the clock, which wasn't really an alarm clock but rather a "carriage clock made by the E.N. Welch Company and being of the "Little Lord Fauntleroy" model.
Searching for Slocum's Clock is great little story and I applaud its author, maritime historian Richard SantaColoma.
https://www.oceannavigator.com/searching-for-slocums-clock/
Just who is
Richard SantaColoma and how would he know about Slocum's clock? A sailor, iceboater, and boat builder, his biography provides the clue:
"Heliodoro Richard SantaColoma was born in New York in 1957. By age 13, he was working as a jeweler, the first employee of David Yurman. At age 15, he was managing a small jewelry manufacturing shop in upstate New York. This led to his becoming, by the age of 20, a bonded diamond setter in New York City's world-renowned Diamond District. While later working in several widely varied fields, he researched and wrote numerous articles and lectured on subjects as varied as early submarine development, yacht design and construction, navigation, cipher history, forgery, and the history of the mysterious Voynich Manuscript. Richard is working on several research projects, and is a consultant for, and/or appeared in several historical documentaries."
Thanks also to Jackie for quoting Joshua's Slocum's wonderful description below, an affirmation how ol' Joshua mostly navigated by Dead Reckoning, (as
DaveH notes) and kept a sharp lookout when close to land.
"I sailed with a free wind day after day, marking the position of my ship on the chart with considerable precision; but this was done by intuition, I think, more than by slavish calculations. For one whole month my vessel held her course true; I had not, the while, so much as a light in the binnacle. The Southern Cross I saw every night abeam. The sun every morning came up astern; every evening it went down ahead. I wished for no other compass to guide me, for these were true. If I doubted my reckoning after a long time at sea I verified it by reading the clock aloft made by the Great Architect, and it was right." Joshua Slocum