A Treatise on the KaleidoscopeArchibald Constable & Company, 1819 - 166 էջ |
From inside the book
Արդյունքներ 26–ի 1-ից 5-ը:
Էջ 4
... eye being necessarily placed with out the trough , and at one end , some of the ce- ment , which had been pressed through between the plates at the object end of the trough , appeared to be arranged in a manner far more regular and ...
... eye being necessarily placed with out the trough , and at one end , some of the ce- ment , which had been pressed through between the plates at the object end of the trough , appeared to be arranged in a manner far more regular and ...
Էջ 5
... ends of the reflectors.90 ) , 3. That out of an infinite number of positions for the eye , there was only one where the symmetry was perfect , namely , as near as possible to the an gular point , so that the circular field could be dis ...
... ends of the reflectors.90 ) , 3. That out of an infinite number of positions for the eye , there was only one where the symmetry was perfect , namely , as near as possible to the an gular point , so that the circular field could be dis ...
Էջ 9
... eye placed at the narrow end E , it will observe the opening A OB multiplied six times , and arranged round the centre O , as shewn in Fig . 2 . In order to understand how this effect is pro- duced , let us take a small sector of white ...
... eye placed at the narrow end E , it will observe the opening A OB multiplied six times , and arranged round the centre O , as shewn in Fig . 2 . In order to understand how this effect is pro- duced , let us take a small sector of white ...
Էջ 28
... eye is applied to the end of the mirrors , or at E , Fig . 1. , the fixed object X seen by direct vision will of course be stationary , while the mirrors describe an arch AM of 10 % for example ; but since A O has ap proached X by 10 ...
... eye is applied to the end of the mirrors , or at E , Fig . 1. , the fixed object X seen by direct vision will of course be stationary , while the mirrors describe an arch AM of 10 % for example ; but since A O has ap proached X by 10 ...
Էջ 36
... eye , we must suppose the object to be placed at a small distance from the end of the mirror . This position is represented in Fig . 10 . where A E is a section of the mirror in the direc- tion of its length ; MNOP an object placed at a ...
... eye , we must suppose the object to be placed at a small distance from the end of the mirror . This position is represented in Fig . 10 . where A E is a section of the mirror in the direc- tion of its length ; MNOP an object placed at a ...
Այլ խմբագրություններ - View all
Common terms and phrases
angle A O B angles of 90 angles of incidence angular aperture angular point aperture apparent magnitude applied beauty brass rim Camera Obscura catoptric centre CHAP circle circular field coloured glass combination composed constructed convex lens DEUTSCHES MUSEUM direct vision distance effects produced equal exhibited eye end field of view figure fixed flectors focal length fragments half Hence images formed inches inclination Indigo instru instrument intensity inverted image ject Kaleido last reflected last sector leidoscope lens light looking-glass manner ment mirror BO motion move number of reflections number of sectors object plate optical ornaments pattern pieces plane mirrors Polyangular polygon position principles rays rectilineal reflected images reflectors at angles regular polygon ring RR round scholium screws seen by direct semitones shewn in Fig shews side specula speculum speculum metal square stationary surface symmetrical picture symmetrically related three reflectors tion transparent triangle tube velocity