31:
106:
The names "deck light", "dead light" or "deadlight" are sometimes used, though the latter is uncommon as a reference to prisms, as more often refers to non-opening plain-glass panels. Deadlights were commonplace for lighting underground vaults in the 19th century, in which application they were also
88:
In normal usage, the prism hangs below the overhead and disperses the light sideways; the top is flat and installed flush with the deck, becoming part of the deck. The lens shapes were naturally derived from the process of handmaking the glass on an 'iron' and would have predated the ability to
81:—all dangerous aboard a wooden ship. The deck prism laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a
248:
92:
To maximize light output, the glass used was originally made colorless with the addition of manganese dioxide; the purple hue of some specimens is caused by decades of exposure to
103:(coal ships), prisms were also used to keep check on the cargo hold: light from a fire would be collected by the prism and be made visible on the deck even in daylight.
89:
manufacture flat glass. (A plain flat glass window would just form a single bright spot below—not very useful for general illumination—hence the prismatic shape.)
277:
256:
306:
221:
185:
135:
301:
296:
160:
125:
100:
191:
140:
120:
108:
47:
290:
78:
30:
54:
93:
82:
66:
62:
225:
195:
17:
130:
74:
58:
70:
249:"Pavement lights, basement lighting, and illuminating vault covers"
50:
inserted into the deck of a ship to provide light down below.
27:
Way of transmitting light from the sun to the inside of a boat
211:
by
Stephan R. Wilks -- Oxford University Press 2021 Page 88
278:
Streetscapes/Subway
Platforms; Letting the Sun Shine In
57:
used deck prisms to provide a safe source of natural
280:By CHRISTOPHER GRAY, New York Times, May 19, 2002
165:Infomarine On-Line Practical Maritime Vocabulary
209:Sandbows and Blacklights, Reflections on Optics
69:, light below a vessel's deck was provided by
8:
29:
152:
7:
190:. July–December 1987. pp. 5–.
25:
111:" (UK) or "vault lights" (US).
1:
34:Group of original deck prisms
323:
61:to illuminate areas below
222:"Solarization of glass"
307:Energy-saving lighting
35:
33:
259:on 13 January 2017
36:
16:(Redirected from
314:
281:
275:
269:
268:
266:
264:
255:. Archived from
244:
238:
237:
235:
233:
224:. Archived from
218:
212:
206:
200:
199:
182:
176:
175:
173:
171:
157:
21:
322:
321:
317:
316:
315:
313:
312:
311:
302:Prisms (optics)
287:
286:
285:
284:
276:
272:
262:
260:
247:Kay, Thornton.
246:
245:
241:
231:
229:
220:
219:
215:
207:
203:
184:
183:
179:
169:
167:
159:
158:
154:
149:
117:
109:pavement lights
53:For centuries,
28:
23:
22:
15:
12:
11:
5:
320:
318:
310:
309:
304:
299:
289:
288:
283:
282:
270:
239:
213:
201:
187:Cruising World
177:
151:
150:
148:
145:
144:
143:
141:Liter of Light
138:
133:
128:
123:
121:Prism lighting
116:
113:
79:kerosene lamps
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
319:
308:
305:
303:
300:
298:
295:
294:
292:
279:
274:
271:
258:
254:
250:
243:
240:
228:on 6 May 2016
227:
223:
217:
214:
210:
205:
202:
197:
193:
189:
188:
181:
178:
166:
162:
156:
153:
146:
142:
139:
137:
134:
132:
129:
127:
124:
122:
119:
118:
114:
112:
110:
104:
102:
97:
95:
90:
86:
84:
80:
76:
72:
68:
64:
60:
56:
55:sailing ships
51:
49:
45:
41:
32:
19:
297:Shipbuilding
273:
261:. Retrieved
257:the original
252:
242:
230:. Retrieved
226:the original
216:
208:
204:
186:
180:
168:. Retrieved
164:
161:"Deck Prism"
155:
105:
98:
91:
87:
52:
43:
39:
37:
136:Daylighting
126:Prism glass
83:fire hazard
67:electricity
18:Deck prisms
291:Categories
263:12 January
147:References
65:. Before
40:deck prism
253:SalvoNEWS
196:0098-3519
170:3 August
131:Porthole
115:See also
107:called "
101:colliers
59:sunlight
44:bullseye
99:Aboard
71:candles
46:, is a
232:1 July
194:
63:decks
48:prism
42:, or
265:2017
234:2015
192:ISSN
172:2014
77:and
75:oil
293::
251:.
163:.
96:.
94:UV
85:.
73:,
38:A
267:.
236:.
198:.
174:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
