dial for watches and domestic clocks, having flat-faced Gothic figures of moderate height, leaving a clear center in the dial, and the heavy "spade" hour hand reaching only to the inner edges of the figures. For public clocks the Arabic numerals are the worst, for at a distance they look like twelve thumb marks on the dial; while the flat-faced Roman remain distinct as twelve clear marks. [Illustration: Fig. 41--Musical Watch, Repeating Hours and Quarters] Do you know that you do not read a public clock by the figures, but by the position of the hands? This was discovered long ago. Lord Grimthorp had one with twelve solid marks on the dial and also speaks of one at the Athenæum Club, both before 1860. The Philadelphia City Hall clock has dials of this kind as shown on right side of Fig. 24. It has also good hands and can be read at a great distance. Very few persons, even in Philadelphia, know that it has no hour numerals on its dials. Still further, there is no clock in the tower, the great hands being moved every minute by air pressure which is regulated by a master clock set in a clock room down below where the walls are 10 ft. thick. Call and see this clock and you will find that the City Hall officials sustain the good name of Philadelphia for politeness. Generally, we give no attention to the hour numerals, even of our watches, as the following proves. When you have taken out your watch and looked at the time, for yourself, and put it back in your pocket, and when a friend asks the time you take it out again to find the time for him! Why? Because, for yourself, you did not read hours and minutes, but only got a mental impression from the position of the hands; so we only read hours and minutes when we are called on to proclaim the time. [Illustration: Fig. 42--Syrian Dial]