58:50 another good analogy for a tellurometer is that of a wall-clock. There are three "hands" - hours, minutes, and seconds. As such, you can visually resolve one second in a half day (20 parts per million). This precision is afforded as, during the period (i.e. half a day) the three hands always have a unique combinatorial position. Any fine error in reading the hours-hand can be corrected by looking at the minutes-hand and so on.
@@jbay088 Correct, indeed, but presumably the "measurand" is not the ticks, but instead the relative differences between the ticks, and *this* secondary quantity shall move like the hands-of-the-clock (slow vs. med vs. fast) behaviuor.
Errata: At 11:12, the envelope shall be that of a phase modulation (i.e. shaped like a fullwave rectified sinewave) rather than (the illustrated) AM at 100% depth of modulation
Interesting note: 41:12 The "printed inductive loops" scheme is also used on most "tablet-pen-digitizers" - Wacom and whatnot.
58:50 another good analogy for a tellurometer is that of a wall-clock. There are three "hands" - hours, minutes, and seconds. As such, you can visually resolve one second in a half day (20 parts per million). This precision is afforded as, during the period (i.e. half a day) the three hands always have a unique combinatorial position. Any fine error in reading the hours-hand can be corrected by looking at the minutes-hand and so on.
The same idea can be applied to the motion of the planets. Thank you for your work commenting on the videos.
That's true, but a tellurometric clock would have three hands that all move at almost the same rate, ticking each 1s, 1.016667s and 1.018056s.
@@jbay088 Correct, indeed, but presumably the "measurand" is not the ticks, but instead the relative differences between the ticks, and *this* secondary quantity shall move like the hands-of-the-clock (slow vs. med vs. fast) behaviuor.
Errata: At 11:12, the envelope shall be that of a phase modulation (i.e. shaped like a fullwave rectified sinewave) rather than (the illustrated) AM at 100% depth of modulation