"You were thirteen months old when we lost her," he answered, bending over the clock-work attachment of the fog bell to wipe off an invisible speck of dust. Since his first term of service on the rock the light had changed from an occulting to a fixed one.
"She is buried there, isn't she," the girl went on. "How strange that, amidst our many journeyings, we have never visited Brighton."
"If I were able to take you to her grave-side, I would not do it," said Brand. "I do not encourage morbid sentiments, even of that perfectly natural kind. Your mother, to you, Constance, is like Enid's to her, a dear but visionary legend. In a degree, it is always so between loved ones lost and those who are left. Truth, honor, work, these are the highest ideals for the individual. They satisfy increasingly. Happy as I am in your companionship, you must not be vexed when I tell you that the most truly joyful moment of my life was conferred when my little friend here first responded accurately to external influences."
He laid his hand on an object resting on a table by itself. It looked like an aneroid barometer, but the others knew it was the marine auriscope to which he had devoted so many patient hours.
"Is it in working order now?" asked Constance instantly, and Enid came nearer. Together they examined the small dial. It was equipped with an arrow-headed pointer, and marked with the divisions of the compass but without the distinguishing letters.
These three understood each other exactly. By inadvertence, the conversation had touched on a topic concerning which Brand was always either vague or silent. Both girls were quick-witted enough to know that Constance's mother was never willingly alluded to either by the lighthouse-keeper or by the elderly Mrs. Sheppard who looked after them in infancy, and was now the housekeeper of Laburnum Cottage.
Constance was annoyed. How could she have been so thoughtless as to cause her father a moment's suffering by bringing up painful reminiscences. But he helped her, being master of himself.
He adjusted a switch in the instrument.
"I had no difficulty in constructing a diaphragm which would intercept all sounds," he said. "The struggle came when I wanted an agent which would distinguish and register a particular set of sounds, no matter what additional din might be prevalent at the same time. My hopes were wrecked so often that I began to despair, until I chanced one day to read how the high-tension induction coil could be tuned to disregard electrical influences other than those issued at the same pitch. My anxiety, until I had procured and experimented with a properly constructed coil, was very trying, I assure you."
"I remember wondering what on earth it was," volunteered Enid. "It sounded like a mathematical snake."