 | Neil Arnott - 1827 - عدد الصفحات: 692
...always equal to the angle of reflection." — According to this law, any irregular surface must break an echo ; and if the irregularity be very considerable,...there can be no distinct or audible reflection at all. And any regular concave surface, as eg, may concentrate sound, and bring all the waves which fall upon... | |
 | Neil Arnott - 1829 - عدد الصفحات: 542
...is equal to the angle of incidence. " — According to this law, any irregular surface must break an echo; and if the irregularity be very considerable,...there can be no distinct or audible reflection at all. A regular concave surface, on the contrary, as e §•, may concentrate sound, and bring all which... | |
 | Neil Arnott - 1841 - عدد الصفحات: 560
...is equal to the angle of incidence." — According to this law, any irregular surface must break an echo; and if the irregularity be very considerable,...can be no - distinct or audible reflection at all. A regular » concave surface, on the contrary, as eg, may concentrate sound, and bring all which falls... | |
 | Neil Arnott - 1853 - عدد الصفحات: 536
...is equal to the angle of incidence." — According to this law, any irregular surface must break an echo; and if the irregularity be very considerable,...there can be no distinct or audible reflection at all. A regular concave surface, on the contrary, aa •• .'/. may concentrate sound, and bring all which... | |
 | Neil Arnott - 1853 - عدد الصفحات: 536
...is equal to the angle of incidence." — According to this law, any irregular surface must break an echo; and if the irregularity be very considerable,...there can be no distinct or audible reflection at all. A regular concave surface, on the contrary, as ey, may concentrate sound, and bring all which falls... | |
 | Neil Arnott - 1856 - عدد الصفحات: 526
...incidence." — According to this law, any irregular surface must break an echo ; and if the regularity be very considerable, there can be no distinct or audible reflection at all. A regular concave surface, on the contrary, as eg, may concentrate sound, and bring all which falls... | |
 | Neil Arnott - 1856 - عدد الصفحات: 510
...incidence." — According to this law, any irregular surface must break an echo ; and if the regularity be very considerable, there can be no distinct or audible reflection at all. A regular concave surface, on the contrary, as e <j, may concentrate sound, and bring all which falls... | |
 | David Ames Wells - 1858 - عدد الصفحات: 466
...the sounds rebound, in such situations, as at 1, 2, 3, 4, from side to side. FIG. 189. regular form. An irregular surface must break the echo; and if the...there can be no distinct or audible reflection at all. 3?or this reason an echo is much less perfect from the front of a house which, has windows and doors,... | |
 | David Ames Wells - 1857 - عدد الصفحات: 492
...perfect echo T &c<!3' \V regular form. An irregular surface must break the echo ; and if the irregulamy be very considerable, there can be no distinct or audible reflection at all. For tnis reason an echo is much less perfect from the front of a house which has windows and aoors, than... | |
 | David Ames Wells - 1860 - عدد الصفحات: 478
...Bounds rebound, in such situations, as at 1, 2, 3, 4, from side to side. FlO. 189. I regular form. An irregular surface must break the echo; and if the...reflection at all. For this reason an echo is much loss perfect from the front of a house which has windows and doors, than from the plane end, or any... | |
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According to this law, any irregular surface must break an echo; and if the irregularity be very considerable, there can be no distinct or audible reflection at all. 
