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Expired
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Alfred Wrench
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Individual
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Individual
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Publication of GB190400382ApublicationCriticalpatent/GB190400382A/en
382. Wrench, A. Jan. 6. Magic-lanterns.- To avoid undue stresses, due to expansion or contraction, and to allow lenses of different t h i c k - nesses to be used, a condenser for an optical lantern has a spring distancepiece e arranged between its lenses c, d which are pressed against flanges g, f on the cup b and the tube a.
GB190400382D1904-01-061904-01-06Improvements in or connected with Condensers for Optical Lanterns
ExpiredGB190400382A
(en)
Improvements in or relating to Lenses, Condensers, Reflectors and other such Glass or similar Articles or Bodies used in connection with or in relation to Means of Illumination.